sys/netinet6/ip6_output.c

   1 /*-
   2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the project nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $
  30  */
  31
  32 /*-
  33  * Copyright (c) 1982, 1986, 1988, 1990, 1993
  34  *      The Regents of the University of California.  All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  * 1. Redistributions of source code must retain the above copyright
  40  *    notice, this list of conditions and the following disclaimer.
  41  * 2. Redistributions in binary form must reproduce the above copyright
  42  *    notice, this list of conditions and the following disclaimer in the
  43  *    documentation and/or other materials provided with the distribution.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  *
  60  *      @(#)ip_output.c 8.3 (Berkeley) 1/21/94
  61  */
  62
  63 #include <sys/cdefs.h>
  64 __FBSDID("$FreeBSD$");
  65
  66 #include "opt_inet.h"
  67 #include "opt_inet6.h"
  68 #include "opt_ipfw.h"
  69 #include "opt_ipsec.h"
  70 #include "opt_sctp.h"
  71 #include "opt_route.h"
  72 #include "opt_rss.h"
  73
  74 #include <sys/param.h>
  75 #include <sys/kernel.h>
  76 #include <sys/malloc.h>
  77 #include <sys/mbuf.h>
  78 #include <sys/errno.h>
  79 #include <sys/priv.h>
  80 #include <sys/proc.h>
  81 #include <sys/protosw.h>
  82 #include <sys/socket.h>
  83 #include <sys/socketvar.h>
  84 #include <sys/syslog.h>
  85 #include <sys/ucred.h>
  86
  87 #include <machine/in_cksum.h>
  88
  89 #include <net/if.h>
  90 #include <net/if_var.h>
  91 #include <net/netisr.h>
  92 #include <net/route.h>
  93 #include <net/pfil.h>
  94 #include <net/vnet.h>
  95
  96 #include <netinet/in.h>
  97 #include <netinet/in_var.h>
  98 #include <netinet/ip_var.h>
  99 #include <netinet6/in6_var.h>
 100 #include <netinet/ip6.h>
 101 #include <netinet/icmp6.h>
 102 #include <netinet6/ip6_var.h>
 103 #include <netinet/in_pcb.h>
 104 #include <netinet/tcp_var.h>
 105 #include <netinet6/nd6.h>
 106 #include <netinet/in_rss.h>
 107
 108 #ifdef IPSEC
 109 #include <netipsec/ipsec.h>
 110 #include <netipsec/ipsec6.h>
 111 #include <netipsec/key.h>
 112 #include <netinet6/ip6_ipsec.h>
 113 #endif /* IPSEC */
 114 #ifdef SCTP
 115 #include <netinet/sctp.h>
 116 #include <netinet/sctp_crc32.h>
 117 #endif
 118
 119 #include <netinet6/ip6protosw.h>
 120 #include <netinet6/scope6_var.h>
 121
 122 #ifdef FLOWTABLE
 123 #include <net/flowtable.h>
 124 #endif
 125
 126 extern int in6_mcast_loop;
 127
 128 struct ip6_exthdrs {
 129         struct mbuf *ip6e_ip6;
 130         struct mbuf *ip6e_hbh;
 131         struct mbuf *ip6e_dest1;
 132         struct mbuf *ip6e_rthdr;
 133         struct mbuf *ip6e_dest2;
 134 };
 135
 136 static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **,
 137                            struct ucred *, int);
 138 static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *,
 139         struct socket *, struct sockopt *);
 140 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *);
 141 static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *,
 142         struct ucred *, int, int, int);
 143
 144 static int ip6_copyexthdr(struct mbuf **, caddr_t, int);
 145 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int,
 146         struct ip6_frag **);
 147 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t);
 148 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *);
 149 static int ip6_getpmtu(struct route_in6 *, struct route_in6 *,
 150         struct ifnet *, struct in6_addr *, u_long *, int *, u_int);
 151 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int);
 152
 153
 154 /*
 155  * Make an extension header from option data.  hp is the source, and
 156  * mp is the destination.
 157  */
 158 #define MAKE_EXTHDR(hp, mp)                                             \
 159     do {                                                                \
 160         if (hp) {                                                       \
 161                 struct ip6_ext *eh = (struct ip6_ext *)(hp);            \
 162                 error = ip6_copyexthdr((mp), (caddr_t)(hp),             \
 163                     ((eh)->ip6e_len + 1) << 3);                         \
 164                 if (error)                                              \
 165                         goto freehdrs;                                  \
 166         }                                                               \
 167     } while (/*CONSTCOND*/ 0)
 168
 169 /*
 170  * Form a chain of extension headers.
 171  * m is the extension header mbuf
 172  * mp is the previous mbuf in the chain
 173  * p is the next header
 174  * i is the type of option.
 175  */
 176 #define MAKE_CHAIN(m, mp, p, i)\
 177     do {\
 178         if (m) {\
 179                 if (!hdrsplit) \
 180                         panic("assumption failed: hdr not split"); \
 181                 *mtod((m), u_char *) = *(p);\
 182                 *(p) = (i);\
 183                 p = mtod((m), u_char *);\
 184                 (m)->m_next = (mp)->m_next;\
 185                 (mp)->m_next = (m);\
 186                 (mp) = (m);\
 187         }\
 188     } while (/*CONSTCOND*/ 0)
 189
 190 void
 191 in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset)
 192 {
 193         u_short csum;
 194
 195         csum = in_cksum_skip(m, offset + plen, offset);
 196         if (m->m_pkthdr.csum_flags & CSUM_UDP_IPV6 && csum == 0)
 197                 csum = 0xffff;
 198         offset += m->m_pkthdr.csum_data;        /* checksum offset */
 199
 200         if (offset + sizeof(u_short) > m->m_len) {
 201                 printf("%s: delayed m_pullup, m->len: %d plen %u off %u "
 202                     "csum_flags=%b\n", __func__, m->m_len, plen, offset,
 203                     (int)m->m_pkthdr.csum_flags, CSUM_BITS);
 204                 /*
 205                  * XXX this should not happen, but if it does, the correct
 206                  * behavior may be to insert the checksum in the appropriate
 207                  * next mbuf in the chain.
 208                  */
 209                 return;
 210         }
 211         *(u_short *)(m->m_data + offset) = csum;
 212 }
 213
 214 /*
 215  * IP6 output. The packet in mbuf chain m contains a skeletal IP6
 216  * header (with pri, len, nxt, hlim, src, dst).
 217  * This function may modify ver and hlim only.
 218  * The mbuf chain containing the packet will be freed.
 219  * The mbuf opt, if present, will not be freed.
 220  * If route_in6 ro is present and has ro_rt initialized, route lookup would be
 221  * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL,
 222  * then result of route lookup is stored in ro->ro_rt.
 223  *
 224  * type of "mtu": rt_mtu is u_long, ifnet.ifr_mtu is int, and
 225  * nd_ifinfo.linkmtu is u_int32_t.  so we use u_long to hold largest one,
 226  * which is rt_mtu.
 227  *
 228  * ifpp - XXX: just for statistics
 229  */
 230 /*
 231  * XXX TODO: no flowid is assigned for outbound flows?
 232  */
 233 int
 234 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt,
 235     struct route_in6 *ro, int flags, struct ip6_moptions *im6o,
 236     struct ifnet **ifpp, struct inpcb *inp)
 237 {
 238         struct ip6_hdr *ip6, *mhip6;
 239         struct ifnet *ifp, *origifp;
 240         struct mbuf *m = m0;
 241         struct mbuf *mprev = NULL;
 242         int hlen, tlen, len, off;
 243         struct route_in6 ip6route;
 244         struct rtentry *rt = NULL;
 245         struct sockaddr_in6 *dst, src_sa, dst_sa;
 246         struct in6_addr odst;
 247         int error = 0;
 248         struct in6_ifaddr *ia = NULL;
 249         u_long mtu;
 250         int alwaysfrag, dontfrag;
 251         u_int32_t optlen = 0, plen = 0, unfragpartlen = 0;
 252         struct ip6_exthdrs exthdrs;
 253         struct in6_addr finaldst, src0, dst0;
 254         u_int32_t zone;
 255         struct route_in6 *ro_pmtu = NULL;
 256         int hdrsplit = 0;
 257         int sw_csum, tso;
 258         int needfiblookup;
 259         uint32_t fibnum;
 260         struct m_tag *fwd_tag = NULL;
 261
 262         ip6 = mtod(m, struct ip6_hdr *);
 263         if (ip6 == NULL) {
 264                 printf ("ip6 is NULL");
 265                 goto bad;
 266         }
 267
 268         if (inp != NULL) {
 269                 M_SETFIB(m, inp->inp_inc.inc_fibnum);
 270                 if ((flags & IP_NODEFAULTFLOWID) == 0) {
 271                         /* unconditionally set flowid */
 272                         m->m_pkthdr.flowid = inp->inp_flowid;
 273                         M_HASHTYPE_SET(m, inp->inp_flowtype);
 274                 }
 275         }
 276
 277         finaldst = ip6->ip6_dst;
 278         bzero(&exthdrs, sizeof(exthdrs));
 279         if (opt) {
 280                 /* Hop-by-Hop options header */
 281                 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh);
 282                 /* Destination options header(1st part) */
 283                 if (opt->ip6po_rthdr) {
 284                         /*
 285                          * Destination options header(1st part)
 286                          * This only makes sense with a routing header.
 287                          * See Section 9.2 of RFC 3542.
 288                          * Disabling this part just for MIP6 convenience is
 289                          * a bad idea.  We need to think carefully about a
 290                          * way to make the advanced API coexist with MIP6
 291                          * options, which might automatically be inserted in
 292                          * the kernel.
 293                          */
 294                         MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1);
 295                 }
 296                 /* Routing header */
 297                 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr);
 298                 /* Destination options header(2nd part) */
 299                 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2);
 300         }
 301
 302 #ifdef IPSEC
 303         /*
 304          * IPSec checking which handles several cases.
 305          * FAST IPSEC: We re-injected the packet.
 306          * XXX: need scope argument.
 307          */
 308         switch(ip6_ipsec_output(&m, inp, &error))
 309         {
 310         case 1:                 /* Bad packet */
 311                 goto freehdrs;
 312         case -1:                /* IPSec done */
 313                 goto done;
 314         case 0:                 /* No IPSec */
 315         default:
 316                 break;
 317         }
 318 #endif /* IPSEC */
 319
 320         /*
 321          * Calculate the total length of the extension header chain.
 322          * Keep the length of the unfragmentable part for fragmentation.
 323          */
 324         optlen = 0;
 325         if (exthdrs.ip6e_hbh)
 326                 optlen += exthdrs.ip6e_hbh->m_len;
 327         if (exthdrs.ip6e_dest1)
 328                 optlen += exthdrs.ip6e_dest1->m_len;
 329         if (exthdrs.ip6e_rthdr)
 330                 optlen += exthdrs.ip6e_rthdr->m_len;
 331         unfragpartlen = optlen + sizeof(struct ip6_hdr);
 332
 333         /* NOTE: we don't add AH/ESP length here (done in ip6_ipsec_output) */
 334         if (exthdrs.ip6e_dest2)
 335                 optlen += exthdrs.ip6e_dest2->m_len;
 336
 337         /*
 338          * If there is at least one extension header,
 339          * separate IP6 header from the payload.
 340          */
 341         if (optlen && !hdrsplit) {
 342                 if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
 343                         m = NULL;
 344                         goto freehdrs;
 345                 }
 346                 m = exthdrs.ip6e_ip6;
 347                 hdrsplit++;
 348         }
 349
 350         /* adjust pointer */
 351         ip6 = mtod(m, struct ip6_hdr *);
 352
 353         /* adjust mbuf packet header length */
 354         m->m_pkthdr.len += optlen;
 355         plen = m->m_pkthdr.len - sizeof(*ip6);
 356
 357         /* If this is a jumbo payload, insert a jumbo payload option. */
 358         if (plen > IPV6_MAXPACKET) {
 359                 if (!hdrsplit) {
 360                         if ((error = ip6_splithdr(m, &exthdrs)) != 0) {
 361                                 m = NULL;
 362                                 goto freehdrs;
 363                         }
 364                         m = exthdrs.ip6e_ip6;
 365                         hdrsplit++;
 366                 }
 367                 /* adjust pointer */
 368                 ip6 = mtod(m, struct ip6_hdr *);
 369                 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0)
 370                         goto freehdrs;
 371                 ip6->ip6_plen = 0;
 372         } else
 373                 ip6->ip6_plen = htons(plen);
 374
 375         /*
 376          * Concatenate headers and fill in next header fields.
 377          * Here we have, on "m"
 378          *      IPv6 payload
 379          * and we insert headers accordingly.  Finally, we should be getting:
 380          *      IPv6 hbh dest1 rthdr ah* [esp* dest2 payload]
 381          *
 382          * during the header composing process, "m" points to IPv6 header.
 383          * "mprev" points to an extension header prior to esp.
 384          */
 385         u_char *nexthdrp = &ip6->ip6_nxt;
 386         mprev = m;
 387
 388         /*
 389          * we treat dest2 specially.  this makes IPsec processing
 390          * much easier.  the goal here is to make mprev point the
 391          * mbuf prior to dest2.
 392          *
 393          * result: IPv6 dest2 payload
 394          * m and mprev will point to IPv6 header.
 395          */
 396         if (exthdrs.ip6e_dest2) {
 397                 if (!hdrsplit)
 398                         panic("assumption failed: hdr not split");
 399                 exthdrs.ip6e_dest2->m_next = m->m_next;
 400                 m->m_next = exthdrs.ip6e_dest2;
 401                 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt;
 402                 ip6->ip6_nxt = IPPROTO_DSTOPTS;
 403         }
 404
 405         /*
 406          * result: IPv6 hbh dest1 rthdr dest2 payload
 407          * m will point to IPv6 header.  mprev will point to the
 408          * extension header prior to dest2 (rthdr in the above case).
 409          */
 410         MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS);
 411         MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp,
 412                    IPPROTO_DSTOPTS);
 413         MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp,
 414                    IPPROTO_ROUTING);
 415
 416         /*
 417          * If there is a routing header, discard the packet.
 418          */
 419         if (exthdrs.ip6e_rthdr) {
 420                  error = EINVAL;
 421                  goto bad;
 422         }
 423
 424         /* Source address validation */
 425         if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) &&
 426             (flags & IPV6_UNSPECSRC) == 0) {
 427                 error = EOPNOTSUPP;
 428                 IP6STAT_INC(ip6s_badscope);
 429                 goto bad;
 430         }
 431         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) {
 432                 error = EOPNOTSUPP;
 433                 IP6STAT_INC(ip6s_badscope);
 434                 goto bad;
 435         }
 436
 437         IP6STAT_INC(ip6s_localout);
 438
 439         /*
 440          * Route packet.
 441          */
 442         if (ro == 0) {
 443                 ro = &ip6route;
 444                 bzero((caddr_t)ro, sizeof(*ro));
 445         }
 446         ro_pmtu = ro;
 447         if (opt && opt->ip6po_rthdr)
 448                 ro = &opt->ip6po_route;
 449         dst = (struct sockaddr_in6 *)&ro->ro_dst;
 450 #ifdef FLOWTABLE
 451         if (ro->ro_rt == NULL)
 452                 (void )flowtable_lookup(AF_INET6, m, (struct route *)ro);
 453 #endif
 454         fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
 455 again:
 456         /*
 457          * if specified, try to fill in the traffic class field.
 458          * do not override if a non-zero value is already set.
 459          * we check the diffserv field and the ecn field separately.
 460          */
 461         if (opt && opt->ip6po_tclass >= 0) {
 462                 int mask = 0;
 463
 464                 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0)
 465                         mask |= 0xfc;
 466                 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0)
 467                         mask |= 0x03;
 468                 if (mask != 0)
 469                         ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20);
 470         }
 471
 472         /* fill in or override the hop limit field, if necessary. */
 473         if (opt && opt->ip6po_hlim != -1)
 474                 ip6->ip6_hlim = opt->ip6po_hlim & 0xff;
 475         else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 476                 if (im6o != NULL)
 477                         ip6->ip6_hlim = im6o->im6o_multicast_hlim;
 478                 else
 479                         ip6->ip6_hlim = V_ip6_defmcasthlim;
 480         }
 481
 482         /* adjust pointer */
 483         ip6 = mtod(m, struct ip6_hdr *);
 484
 485         if (ro->ro_rt && fwd_tag == NULL) {
 486                 rt = ro->ro_rt;
 487                 ifp = ro->ro_rt->rt_ifp;
 488         } else {
 489                 if (fwd_tag == NULL) {
 490                         bzero(&dst_sa, sizeof(dst_sa));
 491                         dst_sa.sin6_family = AF_INET6;
 492                         dst_sa.sin6_len = sizeof(dst_sa);
 493                         dst_sa.sin6_addr = ip6->ip6_dst;
 494                 }
 495                 error = in6_selectroute_fib(&dst_sa, opt, im6o, ro, &ifp,
 496                     &rt, fibnum);
 497                 if (error != 0) {
 498                         if (ifp != NULL)
 499                                 in6_ifstat_inc(ifp, ifs6_out_discard);
 500                         goto bad;
 501                 }
 502         }
 503         if (rt == NULL) {
 504                 /*
 505                  * If in6_selectroute() does not return a route entry,
 506                  * dst may not have been updated.
 507                  */
 508                 *dst = dst_sa;  /* XXX */
 509         }
 510
 511         /*
 512          * then rt (for unicast) and ifp must be non-NULL valid values.
 513          */
 514         if ((flags & IPV6_FORWARDING) == 0) {
 515                 /* XXX: the FORWARDING flag can be set for mrouting. */
 516                 in6_ifstat_inc(ifp, ifs6_out_request);
 517         }
 518         if (rt != NULL) {
 519                 ia = (struct in6_ifaddr *)(rt->rt_ifa);
 520                 counter_u64_add(rt->rt_pksent, 1);
 521         }
 522
 523
 524         /*
 525          * The outgoing interface must be in the zone of source and
 526          * destination addresses.
 527          */
 528         origifp = ifp;
 529
 530         src0 = ip6->ip6_src;
 531         if (in6_setscope(&src0, origifp, &zone))
 532                 goto badscope;
 533         bzero(&src_sa, sizeof(src_sa));
 534         src_sa.sin6_family = AF_INET6;
 535         src_sa.sin6_len = sizeof(src_sa);
 536         src_sa.sin6_addr = ip6->ip6_src;
 537         if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id)
 538                 goto badscope;
 539
 540         dst0 = ip6->ip6_dst;
 541         if (in6_setscope(&dst0, origifp, &zone))
 542                 goto badscope;
 543         /* re-initialize to be sure */
 544         bzero(&dst_sa, sizeof(dst_sa));
 545         dst_sa.sin6_family = AF_INET6;
 546         dst_sa.sin6_len = sizeof(dst_sa);
 547         dst_sa.sin6_addr = ip6->ip6_dst;
 548         if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) {
 549                 goto badscope;
 550         }
 551
 552         /* We should use ia_ifp to support the case of
 553          * sending packets to an address of our own.
 554          */
 555         if (ia != NULL && ia->ia_ifp)
 556                 ifp = ia->ia_ifp;
 557
 558         /* scope check is done. */
 559         goto routefound;
 560
 561   badscope:
 562         IP6STAT_INC(ip6s_badscope);
 563         in6_ifstat_inc(origifp, ifs6_out_discard);
 564         if (error == 0)
 565                 error = EHOSTUNREACH; /* XXX */
 566         goto bad;
 567
 568   routefound:
 569         if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 570                 if (opt && opt->ip6po_nextroute.ro_rt) {
 571                         /*
 572                          * The nexthop is explicitly specified by the
 573                          * application.  We assume the next hop is an IPv6
 574                          * address.
 575                          */
 576                         dst = (struct sockaddr_in6 *)opt->ip6po_nexthop;
 577                 }
 578                 else if ((rt->rt_flags & RTF_GATEWAY))
 579                         dst = (struct sockaddr_in6 *)rt->rt_gateway;
 580         }
 581
 582         if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 583                 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */
 584         } else {
 585                 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST;
 586                 in6_ifstat_inc(ifp, ifs6_out_mcast);
 587                 /*
 588                  * Confirm that the outgoing interface supports multicast.
 589                  */
 590                 if (!(ifp->if_flags & IFF_MULTICAST)) {
 591                         IP6STAT_INC(ip6s_noroute);
 592                         in6_ifstat_inc(ifp, ifs6_out_discard);
 593                         error = ENETUNREACH;
 594                         goto bad;
 595                 }
 596                 if ((im6o == NULL && in6_mcast_loop) ||
 597                     (im6o && im6o->im6o_multicast_loop)) {
 598                         /*
 599                          * Loop back multicast datagram if not expressly
 600                          * forbidden to do so, even if we have not joined
 601                          * the address; protocols will filter it later,
 602                          * thus deferring a hash lookup and lock acquisition
 603                          * at the expense of an m_copym().
 604                          */
 605                         ip6_mloopback(ifp, m, dst);
 606                 } else {
 607                         /*
 608                          * If we are acting as a multicast router, perform
 609                          * multicast forwarding as if the packet had just
 610                          * arrived on the interface to which we are about
 611                          * to send.  The multicast forwarding function
 612                          * recursively calls this function, using the
 613                          * IPV6_FORWARDING flag to prevent infinite recursion.
 614                          *
 615                          * Multicasts that are looped back by ip6_mloopback(),
 616                          * above, will be forwarded by the ip6_input() routine,
 617                          * if necessary.
 618                          */
 619                         if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) {
 620                                 /*
 621                                  * XXX: ip6_mforward expects that rcvif is NULL
 622                                  * when it is called from the originating path.
 623                                  * However, it may not always be the case.
 624                                  */
 625                                 m->m_pkthdr.rcvif = NULL;
 626                                 if (ip6_mforward(ip6, ifp, m) != 0) {
 627                                         m_freem(m);
 628                                         goto done;
 629                                 }
 630                         }
 631                 }
 632                 /*
 633                  * Multicasts with a hoplimit of zero may be looped back,
 634                  * above, but must not be transmitted on a network.
 635                  * Also, multicasts addressed to the loopback interface
 636                  * are not sent -- the above call to ip6_mloopback() will
 637                  * loop back a copy if this host actually belongs to the
 638                  * destination group on the loopback interface.
 639                  */
 640                 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) ||
 641                     IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) {
 642                         m_freem(m);
 643                         goto done;
 644                 }
 645         }
 646
 647         /*
 648          * Fill the outgoing inteface to tell the upper layer
 649          * to increment per-interface statistics.
 650          */
 651         if (ifpp)
 652                 *ifpp = ifp;
 653
 654         /* Determine path MTU. */
 655         if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu,
 656             &alwaysfrag, fibnum)) != 0)
 657                 goto bad;
 658
 659         /*
 660          * The caller of this function may specify to use the minimum MTU
 661          * in some cases.
 662          * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU
 663          * setting.  The logic is a bit complicated; by default, unicast
 664          * packets will follow path MTU while multicast packets will be sent at
 665          * the minimum MTU.  If IP6PO_MINMTU_ALL is specified, all packets
 666          * including unicast ones will be sent at the minimum MTU.  Multicast
 667          * packets will always be sent at the minimum MTU unless
 668          * IP6PO_MINMTU_DISABLE is explicitly specified.
 669          * See RFC 3542 for more details.
 670          */
 671         if (mtu > IPV6_MMTU) {
 672                 if ((flags & IPV6_MINMTU))
 673                         mtu = IPV6_MMTU;
 674                 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL)
 675                         mtu = IPV6_MMTU;
 676                 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
 677                          (opt == NULL ||
 678                           opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) {
 679                         mtu = IPV6_MMTU;
 680                 }
 681         }
 682
 683         /*
 684          * clear embedded scope identifiers if necessary.
 685          * in6_clearscope will touch the addresses only when necessary.
 686          */
 687         in6_clearscope(&ip6->ip6_src);
 688         in6_clearscope(&ip6->ip6_dst);
 689
 690         /*
 691          * If the outgoing packet contains a hop-by-hop options header,
 692          * it must be examined and processed even by the source node.
 693          * (RFC 2460, section 4.)
 694          */
 695         if (exthdrs.ip6e_hbh) {
 696                 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *);
 697                 u_int32_t dummy; /* XXX unused */
 698                 u_int32_t plen = 0; /* XXX: ip6_process will check the value */
 699
 700 #ifdef DIAGNOSTIC
 701                 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len)
 702                         panic("ip6e_hbh is not contiguous");
 703 #endif
 704                 /*
 705                  *  XXX: if we have to send an ICMPv6 error to the sender,
 706                  *       we need the M_LOOP flag since icmp6_error() expects
 707                  *       the IPv6 and the hop-by-hop options header are
 708                  *       contiguous unless the flag is set.
 709                  */
 710                 m->m_flags |= M_LOOP;
 711                 m->m_pkthdr.rcvif = ifp;
 712                 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1),
 713                     ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh),
 714                     &dummy, &plen) < 0) {
 715                         /* m was already freed at this point */
 716                         error = EINVAL;/* better error? */
 717                         goto done;
 718                 }
 719                 m->m_flags &= ~M_LOOP; /* XXX */
 720                 m->m_pkthdr.rcvif = NULL;
 721         }
 722
 723         /* Jump over all PFIL processing if hooks are not active. */
 724         if (!PFIL_HOOKED(&V_inet6_pfil_hook))
 725                 goto passout;
 726
 727         odst = ip6->ip6_dst;
 728         /* Run through list of hooks for output packets. */
 729         error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, inp);
 730         if (error != 0 || m == NULL)
 731                 goto done;
 732         ip6 = mtod(m, struct ip6_hdr *);
 733
 734         needfiblookup = 0;
 735         /* See if destination IP address was changed by packet filter. */
 736         if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) {
 737                 m->m_flags |= M_SKIP_FIREWALL;
 738                 /* If destination is now ourself drop to ip6_input(). */
 739                 if (in6_localip(&ip6->ip6_dst)) {
 740                         m->m_flags |= M_FASTFWD_OURS;
 741                         if (m->m_pkthdr.rcvif == NULL)
 742                                 m->m_pkthdr.rcvif = V_loif;
 743                         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
 744                                 m->m_pkthdr.csum_flags |=
 745                                     CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
 746                                 m->m_pkthdr.csum_data = 0xffff;
 747                         }
 748 #ifdef SCTP
 749                         if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
 750                                 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
 751 #endif
 752                         error = netisr_queue(NETISR_IPV6, m);
 753                         goto done;
 754                 } else
 755                         needfiblookup = 1; /* Redo the routing table lookup. */
 756         }
 757         /* See if fib was changed by packet filter. */
 758         if (fibnum != M_GETFIB(m)) {
 759                 m->m_flags |= M_SKIP_FIREWALL;
 760                 fibnum = M_GETFIB(m);
 761                 RO_RTFREE(ro);
 762                 needfiblookup = 1;
 763         }
 764         if (needfiblookup)
 765                 goto again;
 766
 767         /* See if local, if yes, send it to netisr. */
 768         if (m->m_flags & M_FASTFWD_OURS) {
 769                 if (m->m_pkthdr.rcvif == NULL)
 770                         m->m_pkthdr.rcvif = V_loif;
 771                 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
 772                         m->m_pkthdr.csum_flags |=
 773                             CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
 774                         m->m_pkthdr.csum_data = 0xffff;
 775                 }
 776 #ifdef SCTP
 777                 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
 778                         m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
 779 #endif
 780                 error = netisr_queue(NETISR_IPV6, m);
 781                 goto done;
 782         }
 783         /* Or forward to some other address? */
 784         if ((m->m_flags & M_IP6_NEXTHOP) &&
 785             (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
 786                 dst = (struct sockaddr_in6 *)&ro->ro_dst;
 787                 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6));
 788                 m->m_flags |= M_SKIP_FIREWALL;
 789                 m->m_flags &= ~M_IP6_NEXTHOP;
 790                 m_tag_delete(m, fwd_tag);
 791                 goto again;
 792         }
 793
 794 passout:
 795         /*
 796          * Send the packet to the outgoing interface.
 797          * If necessary, do IPv6 fragmentation before sending.
 798          *
 799          * the logic here is rather complex:
 800          * 1: normal case (dontfrag == 0, alwaysfrag == 0)
 801          * 1-a: send as is if tlen <= path mtu
 802          * 1-b: fragment if tlen > path mtu
 803          *
 804          * 2: if user asks us not to fragment (dontfrag == 1)
 805          * 2-a: send as is if tlen <= interface mtu
 806          * 2-b: error if tlen > interface mtu
 807          *
 808          * 3: if we always need to attach fragment header (alwaysfrag == 1)
 809          *      always fragment
 810          *
 811          * 4: if dontfrag == 1 && alwaysfrag == 1
 812          *      error, as we cannot handle this conflicting request
 813          */
 814         sw_csum = m->m_pkthdr.csum_flags;
 815         if (!hdrsplit) {
 816                 tso = ((sw_csum & ifp->if_hwassist & CSUM_TSO) != 0) ? 1 : 0;
 817                 sw_csum &= ~ifp->if_hwassist;
 818         } else
 819                 tso = 0;
 820         /*
 821          * If we added extension headers, we will not do TSO and calculate the
 822          * checksums ourselves for now.
 823          * XXX-BZ  Need a framework to know when the NIC can handle it, even
 824          * with ext. hdrs.
 825          */
 826         if (sw_csum & CSUM_DELAY_DATA_IPV6) {
 827                 sw_csum &= ~CSUM_DELAY_DATA_IPV6;
 828                 in6_delayed_cksum(m, plen, sizeof(struct ip6_hdr));
 829         }
 830 #ifdef SCTP
 831         if (sw_csum & CSUM_SCTP_IPV6) {
 832                 sw_csum &= ~CSUM_SCTP_IPV6;
 833                 sctp_delayed_cksum(m, sizeof(struct ip6_hdr));
 834         }
 835 #endif
 836         m->m_pkthdr.csum_flags &= ifp->if_hwassist;
 837         tlen = m->m_pkthdr.len;
 838
 839         if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso)
 840                 dontfrag = 1;
 841         else
 842                 dontfrag = 0;
 843         if (dontfrag && alwaysfrag) {   /* case 4 */
 844                 /* conflicting request - can't transmit */
 845                 error = EMSGSIZE;
 846                 goto bad;
 847         }
 848         if (dontfrag && tlen > IN6_LINKMTU(ifp) && !tso) {      /* case 2-b */
 849                 /*
 850                  * Even if the DONTFRAG option is specified, we cannot send the
 851                  * packet when the data length is larger than the MTU of the
 852                  * outgoing interface.
 853                  * Notify the error by sending IPV6_PATHMTU ancillary data as
 854                  * well as returning an error code (the latter is not described
 855                  * in the API spec.)
 856                  */
 857                 u_int32_t mtu32;
 858                 struct ip6ctlparam ip6cp;
 859
 860                 mtu32 = (u_int32_t)mtu;
 861                 bzero(&ip6cp, sizeof(ip6cp));
 862                 ip6cp.ip6c_cmdarg = (void *)&mtu32;
 863                 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst,
 864                     (void *)&ip6cp);
 865
 866                 error = EMSGSIZE;
 867                 goto bad;
 868         }
 869
 870         /*
 871          * transmit packet without fragmentation
 872          */
 873         if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */
 874                 struct in6_ifaddr *ia6;
 875
 876                 ip6 = mtod(m, struct ip6_hdr *);
 877                 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src);
 878                 if (ia6) {
 879                         /* Record statistics for this interface address. */
 880                         counter_u64_add(ia6->ia_ifa.ifa_opackets, 1);
 881                         counter_u64_add(ia6->ia_ifa.ifa_obytes,
 882                             m->m_pkthdr.len);
 883                         ifa_free(&ia6->ia_ifa);
 884                 }
 885                 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
 886                 goto done;
 887         }
 888
 889         /*
 890          * try to fragment the packet.  case 1-b and 3
 891          */
 892         if (mtu < IPV6_MMTU) {
 893                 /* path MTU cannot be less than IPV6_MMTU */
 894                 error = EMSGSIZE;
 895                 in6_ifstat_inc(ifp, ifs6_out_fragfail);
 896                 goto bad;
 897         } else if (ip6->ip6_plen == 0) {
 898                 /* jumbo payload cannot be fragmented */
 899                 error = EMSGSIZE;
 900                 in6_ifstat_inc(ifp, ifs6_out_fragfail);
 901                 goto bad;
 902         } else {
 903                 struct mbuf **mnext, *m_frgpart;
 904                 struct ip6_frag *ip6f;
 905                 u_int32_t id = htonl(ip6_randomid());
 906                 u_char nextproto;
 907
 908                 /*
 909                  * Too large for the destination or interface;
 910                  * fragment if possible.
 911                  * Must be able to put at least 8 bytes per fragment.
 912                  */
 913                 hlen = unfragpartlen;
 914                 if (mtu > IPV6_MAXPACKET)
 915                         mtu = IPV6_MAXPACKET;
 916
 917                 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7;
 918                 if (len < 8) {
 919                         error = EMSGSIZE;
 920                         in6_ifstat_inc(ifp, ifs6_out_fragfail);
 921                         goto bad;
 922                 }
 923
 924                 /*
 925                  * If the interface will not calculate checksums on
 926                  * fragmented packets, then do it here.
 927                  * XXX-BZ handle the hw offloading case.  Need flags.
 928                  */
 929                 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
 930                         in6_delayed_cksum(m, plen, hlen);
 931                         m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
 932                 }
 933 #ifdef SCTP
 934                 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) {
 935                         sctp_delayed_cksum(m, hlen);
 936                         m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6;
 937                 }
 938 #endif
 939                 mnext = &m->m_nextpkt;
 940
 941                 /*
 942                  * Change the next header field of the last header in the
 943                  * unfragmentable part.
 944                  */
 945                 if (exthdrs.ip6e_rthdr) {
 946                         nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *);
 947                         *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT;
 948                 } else if (exthdrs.ip6e_dest1) {
 949                         nextproto = *mtod(exthdrs.ip6e_dest1, u_char *);
 950                         *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT;
 951                 } else if (exthdrs.ip6e_hbh) {
 952                         nextproto = *mtod(exthdrs.ip6e_hbh, u_char *);
 953                         *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT;
 954                 } else {
 955                         nextproto = ip6->ip6_nxt;
 956                         ip6->ip6_nxt = IPPROTO_FRAGMENT;
 957                 }
 958
 959                 /*
 960                  * Loop through length of segment after first fragment,
 961                  * make new header and copy data of each part and link onto
 962                  * chain.
 963                  */
 964                 m0 = m;
 965                 for (off = hlen; off < tlen; off += len) {
 966                         m = m_gethdr(M_NOWAIT, MT_DATA);
 967                         if (!m) {
 968                                 error = ENOBUFS;
 969                                 IP6STAT_INC(ip6s_odropped);
 970                                 goto sendorfree;
 971                         }
 972                         m->m_flags = m0->m_flags & M_COPYFLAGS;
 973                         *mnext = m;
 974                         mnext = &m->m_nextpkt;
 975                         m->m_data += max_linkhdr;
 976                         mhip6 = mtod(m, struct ip6_hdr *);
 977                         *mhip6 = *ip6;
 978                         m->m_len = sizeof(*mhip6);
 979                         error = ip6_insertfraghdr(m0, m, hlen, &ip6f);
 980                         if (error) {
 981                                 IP6STAT_INC(ip6s_odropped);
 982                                 goto sendorfree;
 983                         }
 984                         ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7));
 985                         if (off + len >= tlen)
 986                                 len = tlen - off;
 987                         else
 988                                 ip6f->ip6f_offlg |= IP6F_MORE_FRAG;
 989                         mhip6->ip6_plen = htons((u_short)(len + hlen +
 990                             sizeof(*ip6f) - sizeof(struct ip6_hdr)));
 991                         if ((m_frgpart = m_copy(m0, off, len)) == 0) {
 992                                 error = ENOBUFS;
 993                                 IP6STAT_INC(ip6s_odropped);
 994                                 goto sendorfree;
 995                         }
 996                         m_cat(m, m_frgpart);
 997                         m->m_pkthdr.len = len + hlen + sizeof(*ip6f);
 998                         m->m_pkthdr.fibnum = m0->m_pkthdr.fibnum;
 999                         m->m_pkthdr.rcvif = NULL;
1000                         ip6f->ip6f_reserved = 0;
1001                         ip6f->ip6f_ident = id;
1002                         ip6f->ip6f_nxt = nextproto;
1003                         IP6STAT_INC(ip6s_ofragments);
1004                         in6_ifstat_inc(ifp, ifs6_out_fragcreat);
1005                 }
1006
1007                 in6_ifstat_inc(ifp, ifs6_out_fragok);
1008         }
1009
1010         /*
1011          * Remove leading garbages.
1012          */
1013 sendorfree:
1014         m = m0->m_nextpkt;
1015         m0->m_nextpkt = 0;
1016         m_freem(m0);
1017         for (m0 = m; m; m = m0) {
1018                 m0 = m->m_nextpkt;
1019                 m->m_nextpkt = 0;
1020                 if (error == 0) {
1021                         /* Record statistics for this interface address. */
1022                         if (ia) {
1023                                 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
1024                                 counter_u64_add(ia->ia_ifa.ifa_obytes,
1025                                     m->m_pkthdr.len);
1026                         }
1027                         error = nd6_output(ifp, origifp, m, dst, ro->ro_rt);
1028                 } else
1029                         m_freem(m);
1030         }
1031
1032         if (error == 0)
1033                 IP6STAT_INC(ip6s_fragmented);
1034
1035 done:
1036         if (ro == &ip6route)
1037                 RO_RTFREE(ro);
1038         if (ro_pmtu == &ip6route)
1039                 RO_RTFREE(ro_pmtu);
1040         return (error);
1041
1042 freehdrs:
1043         m_freem(exthdrs.ip6e_hbh);      /* m_freem will check if mbuf is 0 */
1044         m_freem(exthdrs.ip6e_dest1);
1045         m_freem(exthdrs.ip6e_rthdr);
1046         m_freem(exthdrs.ip6e_dest2);
1047         /* FALLTHROUGH */
1048 bad:
1049         if (m)
1050                 m_freem(m);
1051         goto done;
1052 }
1053
1054 static int
1055 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen)
1056 {
1057         struct mbuf *m;
1058
1059         if (hlen > MCLBYTES)
1060                 return (ENOBUFS); /* XXX */
1061
1062         if (hlen > MLEN)
1063                 m = m_getcl(M_NOWAIT, MT_DATA, 0);
1064         else
1065                 m = m_get(M_NOWAIT, MT_DATA);
1066         if (m == NULL)
1067                 return (ENOBUFS);
1068         m->m_len = hlen;
1069         if (hdr)
1070                 bcopy(hdr, mtod(m, caddr_t), hlen);
1071
1072         *mp = m;
1073         return (0);
1074 }
1075
1076 /*
1077  * Insert jumbo payload option.
1078  */
1079 static int
1080 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen)
1081 {
1082         struct mbuf *mopt;
1083         u_char *optbuf;
1084         u_int32_t v;
1085
1086 #define JUMBOOPTLEN     8       /* length of jumbo payload option and padding */
1087
1088         /*
1089          * If there is no hop-by-hop options header, allocate new one.
1090          * If there is one but it doesn't have enough space to store the
1091          * jumbo payload option, allocate a cluster to store the whole options.
1092          * Otherwise, use it to store the options.
1093          */
1094         if (exthdrs->ip6e_hbh == 0) {
1095                 mopt = m_get(M_NOWAIT, MT_DATA);
1096                 if (mopt == NULL)
1097                         return (ENOBUFS);
1098                 mopt->m_len = JUMBOOPTLEN;
1099                 optbuf = mtod(mopt, u_char *);
1100                 optbuf[1] = 0;  /* = ((JUMBOOPTLEN) >> 3) - 1 */
1101                 exthdrs->ip6e_hbh = mopt;
1102         } else {
1103                 struct ip6_hbh *hbh;
1104
1105                 mopt = exthdrs->ip6e_hbh;
1106                 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) {
1107                         /*
1108                          * XXX assumption:
1109                          * - exthdrs->ip6e_hbh is not referenced from places
1110                          *   other than exthdrs.
1111                          * - exthdrs->ip6e_hbh is not an mbuf chain.
1112                          */
1113                         int oldoptlen = mopt->m_len;
1114                         struct mbuf *n;
1115
1116                         /*
1117                          * XXX: give up if the whole (new) hbh header does
1118                          * not fit even in an mbuf cluster.
1119                          */
1120                         if (oldoptlen + JUMBOOPTLEN > MCLBYTES)
1121                                 return (ENOBUFS);
1122
1123                         /*
1124                          * As a consequence, we must always prepare a cluster
1125                          * at this point.
1126                          */
1127                         n = m_getcl(M_NOWAIT, MT_DATA, 0);
1128                         if (n == NULL)
1129                                 return (ENOBUFS);
1130                         n->m_len = oldoptlen + JUMBOOPTLEN;
1131                         bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t),
1132                             oldoptlen);
1133                         optbuf = mtod(n, caddr_t) + oldoptlen;
1134                         m_freem(mopt);
1135                         mopt = exthdrs->ip6e_hbh = n;
1136                 } else {
1137                         optbuf = mtod(mopt, u_char *) + mopt->m_len;
1138                         mopt->m_len += JUMBOOPTLEN;
1139                 }
1140                 optbuf[0] = IP6OPT_PADN;
1141                 optbuf[1] = 1;
1142
1143                 /*
1144                  * Adjust the header length according to the pad and
1145                  * the jumbo payload option.
1146                  */
1147                 hbh = mtod(mopt, struct ip6_hbh *);
1148                 hbh->ip6h_len += (JUMBOOPTLEN >> 3);
1149         }
1150
1151         /* fill in the option. */
1152         optbuf[2] = IP6OPT_JUMBO;
1153         optbuf[3] = 4;
1154         v = (u_int32_t)htonl(plen + JUMBOOPTLEN);
1155         bcopy(&v, &optbuf[4], sizeof(u_int32_t));
1156
1157         /* finally, adjust the packet header length */
1158         exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN;
1159
1160         return (0);
1161 #undef JUMBOOPTLEN
1162 }
1163
1164 /*
1165  * Insert fragment header and copy unfragmentable header portions.
1166  */
1167 static int
1168 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen,
1169     struct ip6_frag **frghdrp)
1170 {
1171         struct mbuf *n, *mlast;
1172
1173         if (hlen > sizeof(struct ip6_hdr)) {
1174                 n = m_copym(m0, sizeof(struct ip6_hdr),
1175                     hlen - sizeof(struct ip6_hdr), M_NOWAIT);
1176                 if (n == 0)
1177                         return (ENOBUFS);
1178                 m->m_next = n;
1179         } else
1180                 n = m;
1181
1182         /* Search for the last mbuf of unfragmentable part. */
1183         for (mlast = n; mlast->m_next; mlast = mlast->m_next)
1184                 ;
1185
1186         if (M_WRITABLE(mlast) &&
1187             M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) {
1188                 /* use the trailing space of the last mbuf for the fragment hdr */
1189                 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) +
1190                     mlast->m_len);
1191                 mlast->m_len += sizeof(struct ip6_frag);
1192                 m->m_pkthdr.len += sizeof(struct ip6_frag);
1193         } else {
1194                 /* allocate a new mbuf for the fragment header */
1195                 struct mbuf *mfrg;
1196
1197                 mfrg = m_get(M_NOWAIT, MT_DATA);
1198                 if (mfrg == NULL)
1199                         return (ENOBUFS);
1200                 mfrg->m_len = sizeof(struct ip6_frag);
1201                 *frghdrp = mtod(mfrg, struct ip6_frag *);
1202                 mlast->m_next = mfrg;
1203         }
1204
1205         return (0);
1206 }
1207
1208 static int
1209 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro,
1210     struct ifnet *ifp, struct in6_addr *dst, u_long *mtup,
1211     int *alwaysfragp, u_int fibnum)
1212 {
1213         u_int32_t mtu = 0;
1214         int alwaysfrag = 0;
1215         int error = 0;
1216
1217         if (ro_pmtu != ro) {
1218                 /* The first hop and the final destination may differ. */
1219                 struct sockaddr_in6 *sa6_dst =
1220                     (struct sockaddr_in6 *)&ro_pmtu->ro_dst;
1221                 if (ro_pmtu->ro_rt &&
1222                     ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 ||
1223                      !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) {
1224                         RTFREE(ro_pmtu->ro_rt);
1225                         ro_pmtu->ro_rt = (struct rtentry *)NULL;
1226                 }
1227                 if (ro_pmtu->ro_rt == NULL) {
1228                         bzero(sa6_dst, sizeof(*sa6_dst));
1229                         sa6_dst->sin6_family = AF_INET6;
1230                         sa6_dst->sin6_len = sizeof(struct sockaddr_in6);
1231                         sa6_dst->sin6_addr = *dst;
1232
1233                         in6_rtalloc(ro_pmtu, fibnum);
1234                 }
1235         }
1236         if (ro_pmtu->ro_rt) {
1237                 u_int32_t ifmtu;
1238                 struct in_conninfo inc;
1239
1240                 bzero(&inc, sizeof(inc));
1241                 inc.inc_flags |= INC_ISIPV6;
1242                 inc.inc6_faddr = *dst;
1243
1244                 if (ifp == NULL)
1245                         ifp = ro_pmtu->ro_rt->rt_ifp;
1246                 ifmtu = IN6_LINKMTU(ifp);
1247                 mtu = tcp_hc_getmtu(&inc);
1248                 if (mtu)
1249                         mtu = min(mtu, ro_pmtu->ro_rt->rt_mtu);
1250                 else
1251                         mtu = ro_pmtu->ro_rt->rt_mtu;
1252                 if (mtu == 0)
1253                         mtu = ifmtu;
1254                 else if (mtu < IPV6_MMTU) {
1255                         /*
1256                          * RFC2460 section 5, last paragraph:
1257                          * if we record ICMPv6 too big message with
1258                          * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU
1259                          * or smaller, with framgent header attached.
1260                          * (fragment header is needed regardless from the
1261                          * packet size, for translators to identify packets)
1262                          */
1263                         alwaysfrag = 1;
1264                         mtu = IPV6_MMTU;
1265                 }
1266         } else if (ifp) {
1267                 mtu = IN6_LINKMTU(ifp);
1268         } else
1269                 error = EHOSTUNREACH; /* XXX */
1270
1271         *mtup = mtu;
1272         if (alwaysfragp)
1273                 *alwaysfragp = alwaysfrag;
1274         return (error);
1275 }
1276
1277 /*
1278  * IP6 socket option processing.
1279  */
1280 int
1281 ip6_ctloutput(struct socket *so, struct sockopt *sopt)
1282 {
1283         int optdatalen, uproto;
1284         void *optdata;
1285         struct inpcb *in6p = sotoinpcb(so);
1286         int error, optval;
1287         int level, op, optname;
1288         int optlen;
1289         struct thread *td;
1290 #ifdef  RSS
1291         uint32_t rss_bucket;
1292         int retval;
1293 #endif
1294
1295         level = sopt->sopt_level;
1296         op = sopt->sopt_dir;
1297         optname = sopt->sopt_name;
1298         optlen = sopt->sopt_valsize;
1299         td = sopt->sopt_td;
1300         error = 0;
1301         optval = 0;
1302         uproto = (int)so->so_proto->pr_protocol;
1303
1304         if (level != IPPROTO_IPV6) {
1305                 error = EINVAL;
1306
1307                 if (sopt->sopt_level == SOL_SOCKET &&
1308                     sopt->sopt_dir == SOPT_SET) {
1309                         switch (sopt->sopt_name) {
1310                         case SO_REUSEADDR:
1311                                 INP_WLOCK(in6p);
1312                                 if ((so->so_options & SO_REUSEADDR) != 0)
1313                                         in6p->inp_flags2 |= INP_REUSEADDR;
1314                                 else
1315                                         in6p->inp_flags2 &= ~INP_REUSEADDR;
1316                                 INP_WUNLOCK(in6p);
1317                                 error = 0;
1318                                 break;
1319                         case SO_REUSEPORT:
1320                                 INP_WLOCK(in6p);
1321                                 if ((so->so_options & SO_REUSEPORT) != 0)
1322                                         in6p->inp_flags2 |= INP_REUSEPORT;
1323                                 else
1324                                         in6p->inp_flags2 &= ~INP_REUSEPORT;
1325                                 INP_WUNLOCK(in6p);
1326                                 error = 0;
1327                                 break;
1328                         case SO_SETFIB:
1329                                 INP_WLOCK(in6p);
1330                                 in6p->inp_inc.inc_fibnum = so->so_fibnum;
1331                                 INP_WUNLOCK(in6p);
1332                                 error = 0;
1333                                 break;
1334                         default:
1335                                 break;
1336                         }
1337                 }
1338         } else {                /* level == IPPROTO_IPV6 */
1339                 switch (op) {
1340
1341                 case SOPT_SET:
1342                         switch (optname) {
1343                         case IPV6_2292PKTOPTIONS:
1344 #ifdef IPV6_PKTOPTIONS
1345                         case IPV6_PKTOPTIONS:
1346 #endif
1347                         {
1348                                 struct mbuf *m;
1349
1350                                 error = soopt_getm(sopt, &m); /* XXX */
1351                                 if (error != 0)
1352                                         break;
1353                                 error = soopt_mcopyin(sopt, m); /* XXX */
1354                                 if (error != 0)
1355                                         break;
1356                                 error = ip6_pcbopts(&in6p->in6p_outputopts,
1357                                                     m, so, sopt);
1358                                 m_freem(m); /* XXX */
1359                                 break;
1360                         }
1361
1362                         /*
1363                          * Use of some Hop-by-Hop options or some
1364                          * Destination options, might require special
1365                          * privilege.  That is, normal applications
1366                          * (without special privilege) might be forbidden
1367                          * from setting certain options in outgoing packets,
1368                          * and might never see certain options in received
1369                          * packets. [RFC 2292 Section 6]
1370                          * KAME specific note:
1371                          *  KAME prevents non-privileged users from sending or
1372                          *  receiving ANY hbh/dst options in order to avoid
1373                          *  overhead of parsing options in the kernel.
1374                          */
1375                         case IPV6_RECVHOPOPTS:
1376                         case IPV6_RECVDSTOPTS:
1377                         case IPV6_RECVRTHDRDSTOPTS:
1378                                 if (td != NULL) {
1379                                         error = priv_check(td,
1380                                             PRIV_NETINET_SETHDROPTS);
1381                                         if (error)
1382                                                 break;
1383                                 }
1384                                 /* FALLTHROUGH */
1385                         case IPV6_UNICAST_HOPS:
1386                         case IPV6_HOPLIMIT:
1387
1388                         case IPV6_RECVPKTINFO:
1389                         case IPV6_RECVHOPLIMIT:
1390                         case IPV6_RECVRTHDR:
1391                         case IPV6_RECVPATHMTU:
1392                         case IPV6_RECVTCLASS:
1393                         case IPV6_V6ONLY:
1394                         case IPV6_AUTOFLOWLABEL:
1395                         case IPV6_BINDANY:
1396                         case IPV6_BINDMULTI:
1397 #ifdef  RSS
1398                         case IPV6_RSS_LISTEN_BUCKET:
1399 #endif
1400                                 if (optname == IPV6_BINDANY && td != NULL) {
1401                                         error = priv_check(td,
1402                                             PRIV_NETINET_BINDANY);
1403                                         if (error)
1404                                                 break;
1405                                 }
1406
1407                                 if (optlen != sizeof(int)) {
1408                                         error = EINVAL;
1409                                         break;
1410                                 }
1411                                 error = sooptcopyin(sopt, &optval,
1412                                         sizeof optval, sizeof optval);
1413                                 if (error)
1414                                         break;
1415                                 switch (optname) {
1416
1417                                 case IPV6_UNICAST_HOPS:
1418                                         if (optval < -1 || optval >= 256)
1419                                                 error = EINVAL;
1420                                         else {
1421                                                 /* -1 = kernel default */
1422                                                 in6p->in6p_hops = optval;
1423                                                 if ((in6p->inp_vflag &
1424                                                      INP_IPV4) != 0)
1425                                                         in6p->inp_ip_ttl = optval;
1426                                         }
1427                                         break;
1428 #define OPTSET(bit) \
1429 do { \
1430         INP_WLOCK(in6p); \
1431         if (optval) \
1432                 in6p->inp_flags |= (bit); \
1433         else \
1434                 in6p->inp_flags &= ~(bit); \
1435         INP_WUNLOCK(in6p); \
1436 } while (/*CONSTCOND*/ 0)
1437 #define OPTSET2292(bit) \
1438 do { \
1439         INP_WLOCK(in6p); \
1440         in6p->inp_flags |= IN6P_RFC2292; \
1441         if (optval) \
1442                 in6p->inp_flags |= (bit); \
1443         else \
1444                 in6p->inp_flags &= ~(bit); \
1445         INP_WUNLOCK(in6p); \
1446 } while (/*CONSTCOND*/ 0)
1447 #define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0)
1448
1449 #define OPTSET2(bit, val) do {                                          \
1450         INP_WLOCK(in6p);                                                \
1451         if (val)                                                        \
1452                 in6p->inp_flags2 |= bit;                                \
1453         else                                                            \
1454                 in6p->inp_flags2 &= ~bit;                               \
1455         INP_WUNLOCK(in6p);                                              \
1456 } while (0)
1457 #define OPTBIT2(bit) (in6p->inp_flags2 & (bit) ? 1 : 0)
1458
1459                                 case IPV6_RECVPKTINFO:
1460                                         /* cannot mix with RFC2292 */
1461                                         if (OPTBIT(IN6P_RFC2292)) {
1462                                                 error = EINVAL;
1463                                                 break;
1464                                         }
1465                                         OPTSET(IN6P_PKTINFO);
1466                                         break;
1467
1468                                 case IPV6_HOPLIMIT:
1469                                 {
1470                                         struct ip6_pktopts **optp;
1471
1472                                         /* cannot mix with RFC2292 */
1473                                         if (OPTBIT(IN6P_RFC2292)) {
1474                                                 error = EINVAL;
1475                                                 break;
1476                                         }
1477                                         optp = &in6p->in6p_outputopts;
1478                                         error = ip6_pcbopt(IPV6_HOPLIMIT,
1479                                             (u_char *)&optval, sizeof(optval),
1480                                             optp, (td != NULL) ? td->td_ucred :
1481                                             NULL, uproto);
1482                                         break;
1483                                 }
1484
1485                                 case IPV6_RECVHOPLIMIT:
1486                                         /* cannot mix with RFC2292 */
1487                                         if (OPTBIT(IN6P_RFC2292)) {
1488                                                 error = EINVAL;
1489                                                 break;
1490                                         }
1491                                         OPTSET(IN6P_HOPLIMIT);
1492                                         break;
1493
1494                                 case IPV6_RECVHOPOPTS:
1495                                         /* cannot mix with RFC2292 */
1496                                         if (OPTBIT(IN6P_RFC2292)) {
1497                                                 error = EINVAL;
1498                                                 break;
1499                                         }
1500                                         OPTSET(IN6P_HOPOPTS);
1501                                         break;
1502
1503                                 case IPV6_RECVDSTOPTS:
1504                                         /* cannot mix with RFC2292 */
1505                                         if (OPTBIT(IN6P_RFC2292)) {
1506                                                 error = EINVAL;
1507                                                 break;
1508                                         }
1509                                         OPTSET(IN6P_DSTOPTS);
1510                                         break;
1511
1512                                 case IPV6_RECVRTHDRDSTOPTS:
1513                                         /* cannot mix with RFC2292 */
1514                                         if (OPTBIT(IN6P_RFC2292)) {
1515                                                 error = EINVAL;
1516                                                 break;
1517                                         }
1518                                         OPTSET(IN6P_RTHDRDSTOPTS);
1519                                         break;
1520
1521                                 case IPV6_RECVRTHDR:
1522                                         /* cannot mix with RFC2292 */
1523                                         if (OPTBIT(IN6P_RFC2292)) {
1524                                                 error = EINVAL;
1525                                                 break;
1526                                         }
1527                                         OPTSET(IN6P_RTHDR);
1528                                         break;
1529
1530                                 case IPV6_RECVPATHMTU:
1531                                         /*
1532                                          * We ignore this option for TCP
1533                                          * sockets.
1534                                          * (RFC3542 leaves this case
1535                                          * unspecified.)
1536                                          */
1537                                         if (uproto != IPPROTO_TCP)
1538                                                 OPTSET(IN6P_MTU);
1539                                         break;
1540
1541                                 case IPV6_V6ONLY:
1542                                         /*
1543                                          * make setsockopt(IPV6_V6ONLY)
1544                                          * available only prior to bind(2).
1545                                          * see ipng mailing list, Jun 22 2001.
1546                                          */
1547                                         if (in6p->inp_lport ||
1548                                             !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1549                                                 error = EINVAL;
1550                                                 break;
1551                                         }
1552                                         OPTSET(IN6P_IPV6_V6ONLY);
1553                                         if (optval)
1554                                                 in6p->inp_vflag &= ~INP_IPV4;
1555                                         else
1556                                                 in6p->inp_vflag |= INP_IPV4;
1557                                         break;
1558                                 case IPV6_RECVTCLASS:
1559                                         /* cannot mix with RFC2292 XXX */
1560                                         if (OPTBIT(IN6P_RFC2292)) {
1561                                                 error = EINVAL;
1562                                                 break;
1563                                         }
1564                                         OPTSET(IN6P_TCLASS);
1565                                         break;
1566                                 case IPV6_AUTOFLOWLABEL:
1567                                         OPTSET(IN6P_AUTOFLOWLABEL);
1568                                         break;
1569
1570                                 case IPV6_BINDANY:
1571                                         OPTSET(INP_BINDANY);
1572                                         break;
1573
1574                                 case IPV6_BINDMULTI:
1575                                         OPTSET2(INP_BINDMULTI, optval);
1576                                         break;
1577 #ifdef  RSS
1578                                 case IPV6_RSS_LISTEN_BUCKET:
1579                                         if ((optval >= 0) &&
1580                                             (optval < rss_getnumbuckets())) {
1581                                                 in6p->inp_rss_listen_bucket = optval;
1582                                                 OPTSET2(INP_RSS_BUCKET_SET, 1);
1583                                         } else {
1584                                                 error = EINVAL;
1585                                         }
1586                                         break;
1587 #endif
1588                                 }
1589                                 break;
1590
1591                         case IPV6_TCLASS:
1592                         case IPV6_DONTFRAG:
1593                         case IPV6_USE_MIN_MTU:
1594                         case IPV6_PREFER_TEMPADDR:
1595                                 if (optlen != sizeof(optval)) {
1596                                         error = EINVAL;
1597                                         break;
1598                                 }
1599                                 error = sooptcopyin(sopt, &optval,
1600                                         sizeof optval, sizeof optval);
1601                                 if (error)
1602                                         break;
1603                                 {
1604                                         struct ip6_pktopts **optp;
1605                                         optp = &in6p->in6p_outputopts;
1606                                         error = ip6_pcbopt(optname,
1607                                             (u_char *)&optval, sizeof(optval),
1608                                             optp, (td != NULL) ? td->td_ucred :
1609                                             NULL, uproto);
1610                                         break;
1611                                 }
1612
1613                         case IPV6_2292PKTINFO:
1614                         case IPV6_2292HOPLIMIT:
1615                         case IPV6_2292HOPOPTS:
1616                         case IPV6_2292DSTOPTS:
1617                         case IPV6_2292RTHDR:
1618                                 /* RFC 2292 */
1619                                 if (optlen != sizeof(int)) {
1620                                         error = EINVAL;
1621                                         break;
1622                                 }
1623                                 error = sooptcopyin(sopt, &optval,
1624                                         sizeof optval, sizeof optval);
1625                                 if (error)
1626                                         break;
1627                                 switch (optname) {
1628                                 case IPV6_2292PKTINFO:
1629                                         OPTSET2292(IN6P_PKTINFO);
1630                                         break;
1631                                 case IPV6_2292HOPLIMIT:
1632                                         OPTSET2292(IN6P_HOPLIMIT);
1633                                         break;
1634                                 case IPV6_2292HOPOPTS:
1635                                         /*
1636                                          * Check super-user privilege.
1637                                          * See comments for IPV6_RECVHOPOPTS.
1638                                          */
1639                                         if (td != NULL) {
1640                                                 error = priv_check(td,
1641                                                     PRIV_NETINET_SETHDROPTS);
1642                                                 if (error)
1643                                                         return (error);
1644                                         }
1645                                         OPTSET2292(IN6P_HOPOPTS);
1646                                         break;
1647                                 case IPV6_2292DSTOPTS:
1648                                         if (td != NULL) {
1649                                                 error = priv_check(td,
1650                                                     PRIV_NETINET_SETHDROPTS);
1651                                                 if (error)
1652                                                         return (error);
1653                                         }
1654                                         OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */
1655                                         break;
1656                                 case IPV6_2292RTHDR:
1657                                         OPTSET2292(IN6P_RTHDR);
1658                                         break;
1659                                 }
1660                                 break;
1661                         case IPV6_PKTINFO:
1662                         case IPV6_HOPOPTS:
1663                         case IPV6_RTHDR:
1664                         case IPV6_DSTOPTS:
1665                         case IPV6_RTHDRDSTOPTS:
1666                         case IPV6_NEXTHOP:
1667                         {
1668                                 /* new advanced API (RFC3542) */
1669                                 u_char *optbuf;
1670                                 u_char optbuf_storage[MCLBYTES];
1671                                 int optlen;
1672                                 struct ip6_pktopts **optp;
1673
1674                                 /* cannot mix with RFC2292 */
1675                                 if (OPTBIT(IN6P_RFC2292)) {
1676                                         error = EINVAL;
1677                                         break;
1678                                 }
1679
1680                                 /*
1681                                  * We only ensure valsize is not too large
1682                                  * here.  Further validation will be done
1683                                  * later.
1684                                  */
1685                                 error = sooptcopyin(sopt, optbuf_storage,
1686                                     sizeof(optbuf_storage), 0);
1687                                 if (error)
1688                                         break;
1689                                 optlen = sopt->sopt_valsize;
1690                                 optbuf = optbuf_storage;
1691                                 optp = &in6p->in6p_outputopts;
1692                                 error = ip6_pcbopt(optname, optbuf, optlen,
1693                                     optp, (td != NULL) ? td->td_ucred : NULL,
1694                                     uproto);
1695                                 break;
1696                         }
1697 #undef OPTSET
1698
1699                         case IPV6_MULTICAST_IF:
1700                         case IPV6_MULTICAST_HOPS:
1701                         case IPV6_MULTICAST_LOOP:
1702                         case IPV6_JOIN_GROUP:
1703                         case IPV6_LEAVE_GROUP:
1704                         case IPV6_MSFILTER:
1705                         case MCAST_BLOCK_SOURCE:
1706                         case MCAST_UNBLOCK_SOURCE:
1707                         case MCAST_JOIN_GROUP:
1708                         case MCAST_LEAVE_GROUP:
1709                         case MCAST_JOIN_SOURCE_GROUP:
1710                         case MCAST_LEAVE_SOURCE_GROUP:
1711                                 error = ip6_setmoptions(in6p, sopt);
1712                                 break;
1713
1714                         case IPV6_PORTRANGE:
1715                                 error = sooptcopyin(sopt, &optval,
1716                                     sizeof optval, sizeof optval);
1717                                 if (error)
1718                                         break;
1719
1720                                 INP_WLOCK(in6p);
1721                                 switch (optval) {
1722                                 case IPV6_PORTRANGE_DEFAULT:
1723                                         in6p->inp_flags &= ~(INP_LOWPORT);
1724                                         in6p->inp_flags &= ~(INP_HIGHPORT);
1725                                         break;
1726
1727                                 case IPV6_PORTRANGE_HIGH:
1728                                         in6p->inp_flags &= ~(INP_LOWPORT);
1729                                         in6p->inp_flags |= INP_HIGHPORT;
1730                                         break;
1731
1732                                 case IPV6_PORTRANGE_LOW:
1733                                         in6p->inp_flags &= ~(INP_HIGHPORT);
1734                                         in6p->inp_flags |= INP_LOWPORT;
1735                                         break;
1736
1737                                 default:
1738                                         error = EINVAL;
1739                                         break;
1740                                 }
1741                                 INP_WUNLOCK(in6p);
1742                                 break;
1743
1744 #ifdef IPSEC
1745                         case IPV6_IPSEC_POLICY:
1746                         {
1747                                 caddr_t req;
1748                                 struct mbuf *m;
1749
1750                                 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */
1751                                         break;
1752                                 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */
1753                                         break;
1754                                 req = mtod(m, caddr_t);
1755                                 error = ipsec_set_policy(in6p, optname, req,
1756                                     m->m_len, (sopt->sopt_td != NULL) ?
1757                                     sopt->sopt_td->td_ucred : NULL);
1758                                 m_freem(m);
1759                                 break;
1760                         }
1761 #endif /* IPSEC */
1762
1763                         default:
1764                                 error = ENOPROTOOPT;
1765                                 break;
1766                         }
1767                         break;
1768
1769                 case SOPT_GET:
1770                         switch (optname) {
1771
1772                         case IPV6_2292PKTOPTIONS:
1773 #ifdef IPV6_PKTOPTIONS
1774                         case IPV6_PKTOPTIONS:
1775 #endif
1776                                 /*
1777                                  * RFC3542 (effectively) deprecated the
1778                                  * semantics of the 2292-style pktoptions.
1779                                  * Since it was not reliable in nature (i.e.,
1780                                  * applications had to expect the lack of some
1781                                  * information after all), it would make sense
1782                                  * to simplify this part by always returning
1783                                  * empty data.
1784                                  */
1785                                 sopt->sopt_valsize = 0;
1786                                 break;
1787
1788                         case IPV6_RECVHOPOPTS:
1789                         case IPV6_RECVDSTOPTS:
1790                         case IPV6_RECVRTHDRDSTOPTS:
1791                         case IPV6_UNICAST_HOPS:
1792                         case IPV6_RECVPKTINFO:
1793                         case IPV6_RECVHOPLIMIT:
1794                         case IPV6_RECVRTHDR:
1795                         case IPV6_RECVPATHMTU:
1796
1797                         case IPV6_V6ONLY:
1798                         case IPV6_PORTRANGE:
1799                         case IPV6_RECVTCLASS:
1800                         case IPV6_AUTOFLOWLABEL:
1801                         case IPV6_BINDANY:
1802                         case IPV6_FLOWID:
1803                         case IPV6_FLOWTYPE:
1804 #ifdef  RSS
1805                         case IPV6_RSSBUCKETID:
1806 #endif
1807                                 switch (optname) {
1808
1809                                 case IPV6_RECVHOPOPTS:
1810                                         optval = OPTBIT(IN6P_HOPOPTS);
1811                                         break;
1812
1813                                 case IPV6_RECVDSTOPTS:
1814                                         optval = OPTBIT(IN6P_DSTOPTS);
1815                                         break;
1816
1817                                 case IPV6_RECVRTHDRDSTOPTS:
1818                                         optval = OPTBIT(IN6P_RTHDRDSTOPTS);
1819                                         break;
1820
1821                                 case IPV6_UNICAST_HOPS:
1822                                         optval = in6p->in6p_hops;
1823                                         break;
1824
1825                                 case IPV6_RECVPKTINFO:
1826                                         optval = OPTBIT(IN6P_PKTINFO);
1827                                         break;
1828
1829                                 case IPV6_RECVHOPLIMIT:
1830                                         optval = OPTBIT(IN6P_HOPLIMIT);
1831                                         break;
1832
1833                                 case IPV6_RECVRTHDR:
1834                                         optval = OPTBIT(IN6P_RTHDR);
1835                                         break;
1836
1837                                 case IPV6_RECVPATHMTU:
1838                                         optval = OPTBIT(IN6P_MTU);
1839                                         break;
1840
1841                                 case IPV6_V6ONLY:
1842                                         optval = OPTBIT(IN6P_IPV6_V6ONLY);
1843                                         break;
1844
1845                                 case IPV6_PORTRANGE:
1846                                     {
1847                                         int flags;
1848                                         flags = in6p->inp_flags;
1849                                         if (flags & INP_HIGHPORT)
1850                                                 optval = IPV6_PORTRANGE_HIGH;
1851                                         else if (flags & INP_LOWPORT)
1852                                                 optval = IPV6_PORTRANGE_LOW;
1853                                         else
1854                                                 optval = 0;
1855                                         break;
1856                                     }
1857                                 case IPV6_RECVTCLASS:
1858                                         optval = OPTBIT(IN6P_TCLASS);
1859                                         break;
1860
1861                                 case IPV6_AUTOFLOWLABEL:
1862                                         optval = OPTBIT(IN6P_AUTOFLOWLABEL);
1863                                         break;
1864
1865                                 case IPV6_BINDANY:
1866                                         optval = OPTBIT(INP_BINDANY);
1867                                         break;
1868
1869                                 case IPV6_FLOWID:
1870                                         optval = in6p->inp_flowid;
1871                                         break;
1872
1873                                 case IPV6_FLOWTYPE:
1874                                         optval = in6p->inp_flowtype;
1875                                         break;
1876 #ifdef  RSS
1877                                 case IPV6_RSSBUCKETID:
1878                                         retval =
1879                                             rss_hash2bucket(in6p->inp_flowid,
1880                                             in6p->inp_flowtype,
1881                                             &rss_bucket);
1882                                         if (retval == 0)
1883                                                 optval = rss_bucket;
1884                                         else
1885                                                 error = EINVAL;
1886                                         break;
1887 #endif
1888
1889                                 case IPV6_BINDMULTI:
1890                                         optval = OPTBIT2(INP_BINDMULTI);
1891                                         break;
1892
1893                                 }
1894                                 if (error)
1895                                         break;
1896                                 error = sooptcopyout(sopt, &optval,
1897                                         sizeof optval);
1898                                 break;
1899
1900                         case IPV6_PATHMTU:
1901                         {
1902                                 u_long pmtu = 0;
1903                                 struct ip6_mtuinfo mtuinfo;
1904                                 struct route_in6 sro;
1905
1906                                 bzero(&sro, sizeof(sro));
1907
1908                                 if (!(so->so_state & SS_ISCONNECTED))
1909                                         return (ENOTCONN);
1910                                 /*
1911                                  * XXX: we dot not consider the case of source
1912                                  * routing, or optional information to specify
1913                                  * the outgoing interface.
1914                                  */
1915                                 error = ip6_getpmtu(&sro, NULL, NULL,
1916                                     &in6p->in6p_faddr, &pmtu, NULL,
1917                                     so->so_fibnum);
1918                                 if (sro.ro_rt)
1919                                         RTFREE(sro.ro_rt);
1920                                 if (error)
1921                                         break;
1922                                 if (pmtu > IPV6_MAXPACKET)
1923                                         pmtu = IPV6_MAXPACKET;
1924
1925                                 bzero(&mtuinfo, sizeof(mtuinfo));
1926                                 mtuinfo.ip6m_mtu = (u_int32_t)pmtu;
1927                                 optdata = (void *)&mtuinfo;
1928                                 optdatalen = sizeof(mtuinfo);
1929                                 error = sooptcopyout(sopt, optdata,
1930                                     optdatalen);
1931                                 break;
1932                         }
1933
1934                         case IPV6_2292PKTINFO:
1935                         case IPV6_2292HOPLIMIT:
1936                         case IPV6_2292HOPOPTS:
1937                         case IPV6_2292RTHDR:
1938                         case IPV6_2292DSTOPTS:
1939                                 switch (optname) {
1940                                 case IPV6_2292PKTINFO:
1941                                         optval = OPTBIT(IN6P_PKTINFO);
1942                                         break;
1943                                 case IPV6_2292HOPLIMIT:
1944                                         optval = OPTBIT(IN6P_HOPLIMIT);
1945                                         break;
1946                                 case IPV6_2292HOPOPTS:
1947                                         optval = OPTBIT(IN6P_HOPOPTS);
1948                                         break;
1949                                 case IPV6_2292RTHDR:
1950                                         optval = OPTBIT(IN6P_RTHDR);
1951                                         break;
1952                                 case IPV6_2292DSTOPTS:
1953                                         optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS);
1954                                         break;
1955                                 }
1956                                 error = sooptcopyout(sopt, &optval,
1957                                     sizeof optval);
1958                                 break;
1959                         case IPV6_PKTINFO:
1960                         case IPV6_HOPOPTS:
1961                         case IPV6_RTHDR:
1962                         case IPV6_DSTOPTS:
1963                         case IPV6_RTHDRDSTOPTS:
1964                         case IPV6_NEXTHOP:
1965                         case IPV6_TCLASS:
1966                         case IPV6_DONTFRAG:
1967                         case IPV6_USE_MIN_MTU:
1968                         case IPV6_PREFER_TEMPADDR:
1969                                 error = ip6_getpcbopt(in6p->in6p_outputopts,
1970                                     optname, sopt);
1971                                 break;
1972
1973                         case IPV6_MULTICAST_IF:
1974                         case IPV6_MULTICAST_HOPS:
1975                         case IPV6_MULTICAST_LOOP:
1976                         case IPV6_MSFILTER:
1977                                 error = ip6_getmoptions(in6p, sopt);
1978                                 break;
1979
1980 #ifdef IPSEC
1981                         case IPV6_IPSEC_POLICY:
1982                           {
1983                                 caddr_t req = NULL;
1984                                 size_t len = 0;
1985                                 struct mbuf *m = NULL;
1986                                 struct mbuf **mp = &m;
1987                                 size_t ovalsize = sopt->sopt_valsize;
1988                                 caddr_t oval = (caddr_t)sopt->sopt_val;
1989
1990                                 error = soopt_getm(sopt, &m); /* XXX */
1991                                 if (error != 0)
1992                                         break;
1993                                 error = soopt_mcopyin(sopt, m); /* XXX */
1994                                 if (error != 0)
1995                                         break;
1996                                 sopt->sopt_valsize = ovalsize;
1997                                 sopt->sopt_val = oval;
1998                                 if (m) {
1999                                         req = mtod(m, caddr_t);
2000                                         len = m->m_len;
2001                                 }
2002                                 error = ipsec_get_policy(in6p, req, len, mp);
2003                                 if (error == 0)
2004                                         error = soopt_mcopyout(sopt, m); /* XXX */
2005                                 if (error == 0 && m)
2006                                         m_freem(m);
2007                                 break;
2008                           }
2009 #endif /* IPSEC */
2010
2011                         default:
2012                                 error = ENOPROTOOPT;
2013                                 break;
2014                         }
2015                         break;
2016                 }
2017         }
2018         return (error);
2019 }
2020
2021 int
2022 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt)
2023 {
2024         int error = 0, optval, optlen;
2025         const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum);
2026         struct inpcb *in6p = sotoinpcb(so);
2027         int level, op, optname;
2028
2029         level = sopt->sopt_level;
2030         op = sopt->sopt_dir;
2031         optname = sopt->sopt_name;
2032         optlen = sopt->sopt_valsize;
2033
2034         if (level != IPPROTO_IPV6) {
2035                 return (EINVAL);
2036         }
2037
2038         switch (optname) {
2039         case IPV6_CHECKSUM:
2040                 /*
2041                  * For ICMPv6 sockets, no modification allowed for checksum
2042                  * offset, permit "no change" values to help existing apps.
2043                  *
2044                  * RFC3542 says: "An attempt to set IPV6_CHECKSUM
2045                  * for an ICMPv6 socket will fail."
2046                  * The current behavior does not meet RFC3542.
2047                  */
2048                 switch (op) {
2049                 case SOPT_SET:
2050                         if (optlen != sizeof(int)) {
2051                                 error = EINVAL;
2052                                 break;
2053                         }
2054                         error = sooptcopyin(sopt, &optval, sizeof(optval),
2055                                             sizeof(optval));
2056                         if (error)
2057                                 break;
2058                         if ((optval % 2) != 0) {
2059                                 /* the API assumes even offset values */
2060                                 error = EINVAL;
2061                         } else if (so->so_proto->pr_protocol ==
2062                             IPPROTO_ICMPV6) {
2063                                 if (optval != icmp6off)
2064                                         error = EINVAL;
2065                         } else
2066                                 in6p->in6p_cksum = optval;
2067                         break;
2068
2069                 case SOPT_GET:
2070                         if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
2071                                 optval = icmp6off;
2072                         else
2073                                 optval = in6p->in6p_cksum;
2074
2075                         error = sooptcopyout(sopt, &optval, sizeof(optval));
2076                         break;
2077
2078                 default:
2079                         error = EINVAL;
2080                         break;
2081                 }
2082                 break;
2083
2084         default:
2085                 error = ENOPROTOOPT;
2086                 break;
2087         }
2088
2089         return (error);
2090 }
2091
2092 /*
2093  * Set up IP6 options in pcb for insertion in output packets or
2094  * specifying behavior of outgoing packets.
2095  */
2096 static int
2097 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m,
2098     struct socket *so, struct sockopt *sopt)
2099 {
2100         struct ip6_pktopts *opt = *pktopt;
2101         int error = 0;
2102         struct thread *td = sopt->sopt_td;
2103
2104         /* turn off any old options. */
2105         if (opt) {
2106 #ifdef DIAGNOSTIC
2107                 if (opt->ip6po_pktinfo || opt->ip6po_nexthop ||
2108                     opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 ||
2109                     opt->ip6po_rhinfo.ip6po_rhi_rthdr)
2110                         printf("ip6_pcbopts: all specified options are cleared.\n");
2111 #endif
2112                 ip6_clearpktopts(opt, -1);
2113         } else
2114                 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK);
2115         *pktopt = NULL;
2116
2117         if (!m || m->m_len == 0) {
2118                 /*
2119                  * Only turning off any previous options, regardless of
2120                  * whether the opt is just created or given.
2121                  */
2122                 free(opt, M_IP6OPT);
2123                 return (0);
2124         }
2125
2126         /*  set options specified by user. */
2127         if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ?
2128             td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) {
2129                 ip6_clearpktopts(opt, -1); /* XXX: discard all options */
2130                 free(opt, M_IP6OPT);
2131                 return (error);
2132         }
2133         *pktopt = opt;
2134         return (0);
2135 }
2136
2137 /*
2138  * initialize ip6_pktopts.  beware that there are non-zero default values in
2139  * the struct.
2140  */
2141 void
2142 ip6_initpktopts(struct ip6_pktopts *opt)
2143 {
2144
2145         bzero(opt, sizeof(*opt));
2146         opt->ip6po_hlim = -1;   /* -1 means default hop limit */
2147         opt->ip6po_tclass = -1; /* -1 means default traffic class */
2148         opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY;
2149         opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM;
2150 }
2151
2152 static int
2153 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt,
2154     struct ucred *cred, int uproto)
2155 {
2156         struct ip6_pktopts *opt;
2157
2158         if (*pktopt == NULL) {
2159                 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT,
2160                     M_WAITOK);
2161                 ip6_initpktopts(*pktopt);
2162         }
2163         opt = *pktopt;
2164
2165         return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto));
2166 }
2167
2168 static int
2169 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt)
2170 {
2171         void *optdata = NULL;
2172         int optdatalen = 0;
2173         struct ip6_ext *ip6e;
2174         int error = 0;
2175         struct in6_pktinfo null_pktinfo;
2176         int deftclass = 0, on;
2177         int defminmtu = IP6PO_MINMTU_MCASTONLY;
2178         int defpreftemp = IP6PO_TEMPADDR_SYSTEM;
2179
2180         switch (optname) {
2181         case IPV6_PKTINFO:
2182                 if (pktopt && pktopt->ip6po_pktinfo)
2183                         optdata = (void *)pktopt->ip6po_pktinfo;
2184                 else {
2185                         /* XXX: we don't have to do this every time... */
2186                         bzero(&null_pktinfo, sizeof(null_pktinfo));
2187                         optdata = (void *)&null_pktinfo;
2188                 }
2189                 optdatalen = sizeof(struct in6_pktinfo);
2190                 break;
2191         case IPV6_TCLASS:
2192                 if (pktopt && pktopt->ip6po_tclass >= 0)
2193                         optdata = (void *)&pktopt->ip6po_tclass;
2194                 else
2195                         optdata = (void *)&deftclass;
2196                 optdatalen = sizeof(int);
2197                 break;
2198         case IPV6_HOPOPTS:
2199                 if (pktopt && pktopt->ip6po_hbh) {
2200                         optdata = (void *)pktopt->ip6po_hbh;
2201                         ip6e = (struct ip6_ext *)pktopt->ip6po_hbh;
2202                         optdatalen = (ip6e->ip6e_len + 1) << 3;
2203                 }
2204                 break;
2205         case IPV6_RTHDR:
2206                 if (pktopt && pktopt->ip6po_rthdr) {
2207                         optdata = (void *)pktopt->ip6po_rthdr;
2208                         ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr;
2209                         optdatalen = (ip6e->ip6e_len + 1) << 3;
2210                 }
2211                 break;
2212         case IPV6_RTHDRDSTOPTS:
2213                 if (pktopt && pktopt->ip6po_dest1) {
2214                         optdata = (void *)pktopt->ip6po_dest1;
2215                         ip6e = (struct ip6_ext *)pktopt->ip6po_dest1;
2216                         optdatalen = (ip6e->ip6e_len + 1) << 3;
2217                 }
2218                 break;
2219         case IPV6_DSTOPTS:
2220                 if (pktopt && pktopt->ip6po_dest2) {
2221                         optdata = (void *)pktopt->ip6po_dest2;
2222                         ip6e = (struct ip6_ext *)pktopt->ip6po_dest2;
2223                         optdatalen = (ip6e->ip6e_len + 1) << 3;
2224                 }
2225                 break;
2226         case IPV6_NEXTHOP:
2227                 if (pktopt && pktopt->ip6po_nexthop) {
2228                         optdata = (void *)pktopt->ip6po_nexthop;
2229                         optdatalen = pktopt->ip6po_nexthop->sa_len;
2230                 }
2231                 break;
2232         case IPV6_USE_MIN_MTU:
2233                 if (pktopt)
2234                         optdata = (void *)&pktopt->ip6po_minmtu;
2235                 else
2236                         optdata = (void *)&defminmtu;
2237                 optdatalen = sizeof(int);
2238                 break;
2239         case IPV6_DONTFRAG:
2240                 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG))
2241                         on = 1;
2242                 else
2243                         on = 0;
2244                 optdata = (void *)&on;
2245                 optdatalen = sizeof(on);
2246                 break;
2247         case IPV6_PREFER_TEMPADDR:
2248                 if (pktopt)
2249                         optdata = (void *)&pktopt->ip6po_prefer_tempaddr;
2250                 else
2251                         optdata = (void *)&defpreftemp;
2252                 optdatalen = sizeof(int);
2253                 break;
2254         default:                /* should not happen */
2255 #ifdef DIAGNOSTIC
2256                 panic("ip6_getpcbopt: unexpected option\n");
2257 #endif
2258                 return (ENOPROTOOPT);
2259         }
2260
2261         error = sooptcopyout(sopt, optdata, optdatalen);
2262
2263         return (error);
2264 }
2265
2266 void
2267 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname)
2268 {
2269         if (pktopt == NULL)
2270                 return;
2271
2272         if (optname == -1 || optname == IPV6_PKTINFO) {
2273                 if (pktopt->ip6po_pktinfo)
2274                         free(pktopt->ip6po_pktinfo, M_IP6OPT);
2275                 pktopt->ip6po_pktinfo = NULL;
2276         }
2277         if (optname == -1 || optname == IPV6_HOPLIMIT)
2278                 pktopt->ip6po_hlim = -1;
2279         if (optname == -1 || optname == IPV6_TCLASS)
2280                 pktopt->ip6po_tclass = -1;
2281         if (optname == -1 || optname == IPV6_NEXTHOP) {
2282                 if (pktopt->ip6po_nextroute.ro_rt) {
2283                         RTFREE(pktopt->ip6po_nextroute.ro_rt);
2284                         pktopt->ip6po_nextroute.ro_rt = NULL;
2285                 }
2286                 if (pktopt->ip6po_nexthop)
2287                         free(pktopt->ip6po_nexthop, M_IP6OPT);
2288                 pktopt->ip6po_nexthop = NULL;
2289         }
2290         if (optname == -1 || optname == IPV6_HOPOPTS) {
2291                 if (pktopt->ip6po_hbh)
2292                         free(pktopt->ip6po_hbh, M_IP6OPT);
2293                 pktopt->ip6po_hbh = NULL;
2294         }
2295         if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) {
2296                 if (pktopt->ip6po_dest1)
2297                         free(pktopt->ip6po_dest1, M_IP6OPT);
2298                 pktopt->ip6po_dest1 = NULL;
2299         }
2300         if (optname == -1 || optname == IPV6_RTHDR) {
2301                 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr)
2302                         free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT);
2303                 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL;
2304                 if (pktopt->ip6po_route.ro_rt) {
2305                         RTFREE(pktopt->ip6po_route.ro_rt);
2306                         pktopt->ip6po_route.ro_rt = NULL;
2307                 }
2308         }
2309         if (optname == -1 || optname == IPV6_DSTOPTS) {
2310                 if (pktopt->ip6po_dest2)
2311                         free(pktopt->ip6po_dest2, M_IP6OPT);
2312                 pktopt->ip6po_dest2 = NULL;
2313         }
2314 }
2315
2316 #define PKTOPT_EXTHDRCPY(type) \
2317 do {\
2318         if (src->type) {\
2319                 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\
2320                 dst->type = malloc(hlen, M_IP6OPT, canwait);\
2321                 if (dst->type == NULL && canwait == M_NOWAIT)\
2322                         goto bad;\
2323                 bcopy(src->type, dst->type, hlen);\
2324         }\
2325 } while (/*CONSTCOND*/ 0)
2326
2327 static int
2328 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait)
2329 {
2330         if (dst == NULL || src == NULL)  {
2331                 printf("ip6_clearpktopts: invalid argument\n");
2332                 return (EINVAL);
2333         }
2334
2335         dst->ip6po_hlim = src->ip6po_hlim;
2336         dst->ip6po_tclass = src->ip6po_tclass;
2337         dst->ip6po_flags = src->ip6po_flags;
2338         dst->ip6po_minmtu = src->ip6po_minmtu;
2339         dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr;
2340         if (src->ip6po_pktinfo) {
2341                 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo),
2342                     M_IP6OPT, canwait);
2343                 if (dst->ip6po_pktinfo == NULL)
2344                         goto bad;
2345                 *dst->ip6po_pktinfo = *src->ip6po_pktinfo;
2346         }
2347         if (src->ip6po_nexthop) {
2348                 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len,
2349                     M_IP6OPT, canwait);
2350                 if (dst->ip6po_nexthop == NULL)
2351                         goto bad;
2352                 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop,
2353                     src->ip6po_nexthop->sa_len);
2354         }
2355         PKTOPT_EXTHDRCPY(ip6po_hbh);
2356         PKTOPT_EXTHDRCPY(ip6po_dest1);
2357         PKTOPT_EXTHDRCPY(ip6po_dest2);
2358         PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */
2359         return (0);
2360
2361   bad:
2362         ip6_clearpktopts(dst, -1);
2363         return (ENOBUFS);
2364 }
2365 #undef PKTOPT_EXTHDRCPY
2366
2367 struct ip6_pktopts *
2368 ip6_copypktopts(struct ip6_pktopts *src, int canwait)
2369 {
2370         int error;
2371         struct ip6_pktopts *dst;
2372
2373         dst = malloc(sizeof(*dst), M_IP6OPT, canwait);
2374         if (dst == NULL)
2375                 return (NULL);
2376         ip6_initpktopts(dst);
2377
2378         if ((error = copypktopts(dst, src, canwait)) != 0) {
2379                 free(dst, M_IP6OPT);
2380                 return (NULL);
2381         }
2382
2383         return (dst);
2384 }
2385
2386 void
2387 ip6_freepcbopts(struct ip6_pktopts *pktopt)
2388 {
2389         if (pktopt == NULL)
2390                 return;
2391
2392         ip6_clearpktopts(pktopt, -1);
2393
2394         free(pktopt, M_IP6OPT);
2395 }
2396
2397 /*
2398  * Set IPv6 outgoing packet options based on advanced API.
2399  */
2400 int
2401 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt,
2402     struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto)
2403 {
2404         struct cmsghdr *cm = 0;
2405
2406         if (control == NULL || opt == NULL)
2407                 return (EINVAL);
2408
2409         ip6_initpktopts(opt);
2410         if (stickyopt) {
2411                 int error;
2412
2413                 /*
2414                  * If stickyopt is provided, make a local copy of the options
2415                  * for this particular packet, then override them by ancillary
2416                  * objects.
2417                  * XXX: copypktopts() does not copy the cached route to a next
2418                  * hop (if any).  This is not very good in terms of efficiency,
2419                  * but we can allow this since this option should be rarely
2420                  * used.
2421                  */
2422                 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0)
2423                         return (error);
2424         }
2425
2426         /*
2427          * XXX: Currently, we assume all the optional information is stored
2428          * in a single mbuf.
2429          */
2430         if (control->m_next)
2431                 return (EINVAL);
2432
2433         for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len),
2434             control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
2435                 int error;
2436
2437                 if (control->m_len < CMSG_LEN(0))
2438                         return (EINVAL);
2439
2440                 cm = mtod(control, struct cmsghdr *);
2441                 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len)
2442                         return (EINVAL);
2443                 if (cm->cmsg_level != IPPROTO_IPV6)
2444                         continue;
2445
2446                 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm),
2447                     cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto);
2448                 if (error)
2449                         return (error);
2450         }
2451
2452         return (0);
2453 }
2454
2455 /*
2456  * Set a particular packet option, as a sticky option or an ancillary data
2457  * item.  "len" can be 0 only when it's a sticky option.
2458  * We have 4 cases of combination of "sticky" and "cmsg":
2459  * "sticky=0, cmsg=0": impossible
2460  * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data
2461  * "sticky=1, cmsg=0": RFC3542 socket option
2462  * "sticky=1, cmsg=1": RFC2292 socket option
2463  */
2464 static int
2465 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt,
2466     struct ucred *cred, int sticky, int cmsg, int uproto)
2467 {
2468         int minmtupolicy, preftemp;
2469         int error;
2470
2471         if (!sticky && !cmsg) {
2472 #ifdef DIAGNOSTIC
2473                 printf("ip6_setpktopt: impossible case\n");
2474 #endif
2475                 return (EINVAL);
2476         }
2477
2478         /*
2479          * IPV6_2292xxx is for backward compatibility to RFC2292, and should
2480          * not be specified in the context of RFC3542.  Conversely,
2481          * RFC3542 types should not be specified in the context of RFC2292.
2482          */
2483         if (!cmsg) {
2484                 switch (optname) {
2485                 case IPV6_2292PKTINFO:
2486                 case IPV6_2292HOPLIMIT:
2487                 case IPV6_2292NEXTHOP:
2488                 case IPV6_2292HOPOPTS:
2489                 case IPV6_2292DSTOPTS:
2490                 case IPV6_2292RTHDR:
2491                 case IPV6_2292PKTOPTIONS:
2492                         return (ENOPROTOOPT);
2493                 }
2494         }
2495         if (sticky && cmsg) {
2496                 switch (optname) {
2497                 case IPV6_PKTINFO:
2498                 case IPV6_HOPLIMIT:
2499                 case IPV6_NEXTHOP:
2500                 case IPV6_HOPOPTS:
2501                 case IPV6_DSTOPTS:
2502                 case IPV6_RTHDRDSTOPTS:
2503                 case IPV6_RTHDR:
2504                 case IPV6_USE_MIN_MTU:
2505                 case IPV6_DONTFRAG:
2506                 case IPV6_TCLASS:
2507                 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */
2508                         return (ENOPROTOOPT);
2509                 }
2510         }
2511
2512         switch (optname) {
2513         case IPV6_2292PKTINFO:
2514         case IPV6_PKTINFO:
2515         {
2516                 struct ifnet *ifp = NULL;
2517                 struct in6_pktinfo *pktinfo;
2518
2519                 if (len != sizeof(struct in6_pktinfo))
2520                         return (EINVAL);
2521
2522                 pktinfo = (struct in6_pktinfo *)buf;
2523
2524                 /*
2525                  * An application can clear any sticky IPV6_PKTINFO option by
2526                  * doing a "regular" setsockopt with ipi6_addr being
2527                  * in6addr_any and ipi6_ifindex being zero.
2528                  * [RFC 3542, Section 6]
2529                  */
2530                 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo &&
2531                     pktinfo->ipi6_ifindex == 0 &&
2532                     IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2533                         ip6_clearpktopts(opt, optname);
2534                         break;
2535                 }
2536
2537                 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO &&
2538                     sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2539                         return (EINVAL);
2540                 }
2541                 if (IN6_IS_ADDR_MULTICAST(&pktinfo->ipi6_addr))
2542                         return (EINVAL);
2543                 /* validate the interface index if specified. */
2544                 if (pktinfo->ipi6_ifindex > V_if_index)
2545                          return (ENXIO);
2546                 if (pktinfo->ipi6_ifindex) {
2547                         ifp = ifnet_byindex(pktinfo->ipi6_ifindex);
2548                         if (ifp == NULL)
2549                                 return (ENXIO);
2550                 }
2551                 if (ifp != NULL && (
2552                     ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED))
2553                         return (ENETDOWN);
2554
2555                 if (ifp != NULL &&
2556                     !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
2557                         struct in6_ifaddr *ia;
2558
2559                         ia = in6ifa_ifpwithaddr(ifp, &pktinfo->ipi6_addr);
2560                         if (ia == NULL)
2561                                 return (EADDRNOTAVAIL);
2562                         ifa_free(&ia->ia_ifa);
2563                 }
2564                 /*
2565                  * We store the address anyway, and let in6_selectsrc()
2566                  * validate the specified address.  This is because ipi6_addr
2567                  * may not have enough information about its scope zone, and
2568                  * we may need additional information (such as outgoing
2569                  * interface or the scope zone of a destination address) to
2570                  * disambiguate the scope.
2571                  * XXX: the delay of the validation may confuse the
2572                  * application when it is used as a sticky option.
2573                  */
2574                 if (opt->ip6po_pktinfo == NULL) {
2575                         opt->ip6po_pktinfo = malloc(sizeof(*pktinfo),
2576                             M_IP6OPT, M_NOWAIT);
2577                         if (opt->ip6po_pktinfo == NULL)
2578                                 return (ENOBUFS);
2579                 }
2580                 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo));
2581                 break;
2582         }
2583
2584         case IPV6_2292HOPLIMIT:
2585         case IPV6_HOPLIMIT:
2586         {
2587                 int *hlimp;
2588
2589                 /*
2590                  * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT
2591                  * to simplify the ordering among hoplimit options.
2592                  */
2593                 if (optname == IPV6_HOPLIMIT && sticky)
2594                         return (ENOPROTOOPT);
2595
2596                 if (len != sizeof(int))
2597                         return (EINVAL);
2598                 hlimp = (int *)buf;
2599                 if (*hlimp < -1 || *hlimp > 255)
2600                         return (EINVAL);
2601
2602                 opt->ip6po_hlim = *hlimp;
2603                 break;
2604         }
2605
2606         case IPV6_TCLASS:
2607         {
2608                 int tclass;
2609
2610                 if (len != sizeof(int))
2611                         return (EINVAL);
2612                 tclass = *(int *)buf;
2613                 if (tclass < -1 || tclass > 255)
2614                         return (EINVAL);
2615
2616                 opt->ip6po_tclass = tclass;
2617                 break;
2618         }
2619
2620         case IPV6_2292NEXTHOP:
2621         case IPV6_NEXTHOP:
2622                 if (cred != NULL) {
2623                         error = priv_check_cred(cred,
2624                             PRIV_NETINET_SETHDROPTS, 0);
2625                         if (error)
2626                                 return (error);
2627                 }
2628
2629                 if (len == 0) { /* just remove the option */
2630                         ip6_clearpktopts(opt, IPV6_NEXTHOP);
2631                         break;
2632                 }
2633
2634                 /* check if cmsg_len is large enough for sa_len */
2635                 if (len < sizeof(struct sockaddr) || len < *buf)
2636                         return (EINVAL);
2637
2638                 switch (((struct sockaddr *)buf)->sa_family) {
2639                 case AF_INET6:
2640                 {
2641                         struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf;
2642                         int error;
2643
2644                         if (sa6->sin6_len != sizeof(struct sockaddr_in6))
2645                                 return (EINVAL);
2646
2647                         if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) ||
2648                             IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
2649                                 return (EINVAL);
2650                         }
2651                         if ((error = sa6_embedscope(sa6, V_ip6_use_defzone))
2652                             != 0) {
2653                                 return (error);
2654                         }
2655                         break;
2656                 }
2657                 case AF_LINK:   /* should eventually be supported */
2658                 default:
2659                         return (EAFNOSUPPORT);
2660                 }
2661
2662                 /* turn off the previous option, then set the new option. */
2663                 ip6_clearpktopts(opt, IPV6_NEXTHOP);
2664                 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT);
2665                 if (opt->ip6po_nexthop == NULL)
2666                         return (ENOBUFS);
2667                 bcopy(buf, opt->ip6po_nexthop, *buf);
2668                 break;
2669
2670         case IPV6_2292HOPOPTS:
2671         case IPV6_HOPOPTS:
2672         {
2673                 struct ip6_hbh *hbh;
2674                 int hbhlen;
2675
2676                 /*
2677                  * XXX: We don't allow a non-privileged user to set ANY HbH
2678                  * options, since per-option restriction has too much
2679                  * overhead.
2680                  */
2681                 if (cred != NULL) {
2682                         error = priv_check_cred(cred,
2683                             PRIV_NETINET_SETHDROPTS, 0);
2684                         if (error)
2685                                 return (error);
2686                 }
2687
2688                 if (len == 0) {
2689                         ip6_clearpktopts(opt, IPV6_HOPOPTS);
2690                         break;  /* just remove the option */
2691                 }
2692
2693                 /* message length validation */
2694                 if (len < sizeof(struct ip6_hbh))
2695                         return (EINVAL);
2696                 hbh = (struct ip6_hbh *)buf;
2697                 hbhlen = (hbh->ip6h_len + 1) << 3;
2698                 if (len != hbhlen)
2699                         return (EINVAL);
2700
2701                 /* turn off the previous option, then set the new option. */
2702                 ip6_clearpktopts(opt, IPV6_HOPOPTS);
2703                 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT);
2704                 if (opt->ip6po_hbh == NULL)
2705                         return (ENOBUFS);
2706                 bcopy(hbh, opt->ip6po_hbh, hbhlen);
2707
2708                 break;
2709         }
2710
2711         case IPV6_2292DSTOPTS:
2712         case IPV6_DSTOPTS:
2713         case IPV6_RTHDRDSTOPTS:
2714         {
2715                 struct ip6_dest *dest, **newdest = NULL;
2716                 int destlen;
2717
2718                 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */
2719                         error = priv_check_cred(cred,
2720                             PRIV_NETINET_SETHDROPTS, 0);
2721                         if (error)
2722                                 return (error);
2723                 }
2724
2725                 if (len == 0) {
2726                         ip6_clearpktopts(opt, optname);
2727                         break;  /* just remove the option */
2728                 }
2729
2730                 /* message length validation */
2731                 if (len < sizeof(struct ip6_dest))
2732                         return (EINVAL);
2733                 dest = (struct ip6_dest *)buf;
2734                 destlen = (dest->ip6d_len + 1) << 3;
2735                 if (len != destlen)
2736                         return (EINVAL);
2737
2738                 /*
2739                  * Determine the position that the destination options header
2740                  * should be inserted; before or after the routing header.
2741                  */
2742                 switch (optname) {
2743                 case IPV6_2292DSTOPTS:
2744                         /*
2745                          * The old advacned API is ambiguous on this point.
2746                          * Our approach is to determine the position based
2747                          * according to the existence of a routing header.
2748                          * Note, however, that this depends on the order of the
2749                          * extension headers in the ancillary data; the 1st
2750                          * part of the destination options header must appear
2751                          * before the routing header in the ancillary data,
2752                          * too.
2753                          * RFC3542 solved the ambiguity by introducing
2754                          * separate ancillary data or option types.
2755                          */
2756                         if (opt->ip6po_rthdr == NULL)
2757                                 newdest = &opt->ip6po_dest1;
2758                         else
2759                                 newdest = &opt->ip6po_dest2;
2760                         break;
2761                 case IPV6_RTHDRDSTOPTS:
2762                         newdest = &opt->ip6po_dest1;
2763                         break;
2764                 case IPV6_DSTOPTS:
2765                         newdest = &opt->ip6po_dest2;
2766                         break;
2767                 }
2768
2769                 /* turn off the previous option, then set the new option. */
2770                 ip6_clearpktopts(opt, optname);
2771                 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT);
2772                 if (*newdest == NULL)
2773                         return (ENOBUFS);
2774                 bcopy(dest, *newdest, destlen);
2775
2776                 break;
2777         }
2778
2779         case IPV6_2292RTHDR:
2780         case IPV6_RTHDR:
2781         {
2782                 struct ip6_rthdr *rth;
2783                 int rthlen;
2784
2785                 if (len == 0) {
2786                         ip6_clearpktopts(opt, IPV6_RTHDR);
2787                         break;  /* just remove the option */
2788                 }
2789
2790                 /* message length validation */
2791                 if (len < sizeof(struct ip6_rthdr))
2792                         return (EINVAL);
2793                 rth = (struct ip6_rthdr *)buf;
2794                 rthlen = (rth->ip6r_len + 1) << 3;
2795                 if (len != rthlen)
2796                         return (EINVAL);
2797
2798                 switch (rth->ip6r_type) {
2799                 case IPV6_RTHDR_TYPE_0:
2800                         if (rth->ip6r_len == 0) /* must contain one addr */
2801                                 return (EINVAL);
2802                         if (rth->ip6r_len % 2) /* length must be even */
2803                                 return (EINVAL);
2804                         if (rth->ip6r_len / 2 != rth->ip6r_segleft)
2805                                 return (EINVAL);
2806                         break;
2807                 default:
2808                         return (EINVAL);        /* not supported */
2809                 }
2810
2811                 /* turn off the previous option */
2812                 ip6_clearpktopts(opt, IPV6_RTHDR);
2813                 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT);
2814                 if (opt->ip6po_rthdr == NULL)
2815                         return (ENOBUFS);
2816                 bcopy(rth, opt->ip6po_rthdr, rthlen);
2817
2818                 break;
2819         }
2820
2821         case IPV6_USE_MIN_MTU:
2822                 if (len != sizeof(int))
2823                         return (EINVAL);
2824                 minmtupolicy = *(int *)buf;
2825                 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY &&
2826                     minmtupolicy != IP6PO_MINMTU_DISABLE &&
2827                     minmtupolicy != IP6PO_MINMTU_ALL) {
2828                         return (EINVAL);
2829                 }
2830                 opt->ip6po_minmtu = minmtupolicy;
2831                 break;
2832
2833         case IPV6_DONTFRAG:
2834                 if (len != sizeof(int))
2835                         return (EINVAL);
2836
2837                 if (uproto == IPPROTO_TCP || *(int *)buf == 0) {
2838                         /*
2839                          * we ignore this option for TCP sockets.
2840                          * (RFC3542 leaves this case unspecified.)
2841                          */
2842                         opt->ip6po_flags &= ~IP6PO_DONTFRAG;
2843                 } else
2844                         opt->ip6po_flags |= IP6PO_DONTFRAG;
2845                 break;
2846
2847         case IPV6_PREFER_TEMPADDR:
2848                 if (len != sizeof(int))
2849                         return (EINVAL);
2850                 preftemp = *(int *)buf;
2851                 if (preftemp != IP6PO_TEMPADDR_SYSTEM &&
2852                     preftemp != IP6PO_TEMPADDR_NOTPREFER &&
2853                     preftemp != IP6PO_TEMPADDR_PREFER) {
2854                         return (EINVAL);
2855                 }
2856                 opt->ip6po_prefer_tempaddr = preftemp;
2857                 break;
2858
2859         default:
2860                 return (ENOPROTOOPT);
2861         } /* end of switch */
2862
2863         return (0);
2864 }
2865
2866 /*
2867  * Routine called from ip6_output() to loop back a copy of an IP6 multicast
2868  * packet to the input queue of a specified interface.  Note that this
2869  * calls the output routine of the loopback "driver", but with an interface
2870  * pointer that might NOT be &loif -- easier than replicating that code here.
2871  */
2872 void
2873 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst)
2874 {
2875         struct mbuf *copym;
2876         struct ip6_hdr *ip6;
2877
2878         copym = m_copy(m, 0, M_COPYALL);
2879         if (copym == NULL)
2880                 return;
2881
2882         /*
2883          * Make sure to deep-copy IPv6 header portion in case the data
2884          * is in an mbuf cluster, so that we can safely override the IPv6
2885          * header portion later.
2886          */
2887         if (!M_WRITABLE(copym) ||
2888             copym->m_len < sizeof(struct ip6_hdr)) {
2889                 copym = m_pullup(copym, sizeof(struct ip6_hdr));
2890                 if (copym == NULL)
2891                         return;
2892         }
2893
2894 #ifdef DIAGNOSTIC
2895         if (copym->m_len < sizeof(*ip6)) {
2896                 m_freem(copym);
2897                 return;
2898         }
2899 #endif
2900
2901         ip6 = mtod(copym, struct ip6_hdr *);
2902         /*
2903          * clear embedded scope identifiers if necessary.
2904          * in6_clearscope will touch the addresses only when necessary.
2905          */
2906         in6_clearscope(&ip6->ip6_src);
2907         in6_clearscope(&ip6->ip6_dst);
2908
2909         (void)if_simloop(ifp, copym, dst->sin6_family, 0);
2910 }
2911
2912 /*
2913  * Chop IPv6 header off from the payload.
2914  */
2915 static int
2916 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs)
2917 {
2918         struct mbuf *mh;
2919         struct ip6_hdr *ip6;
2920
2921         ip6 = mtod(m, struct ip6_hdr *);
2922         if (m->m_len > sizeof(*ip6)) {
2923                 mh = m_gethdr(M_NOWAIT, MT_DATA);
2924                 if (mh == NULL) {
2925                         m_freem(m);
2926                         return ENOBUFS;
2927                 }
2928                 m_move_pkthdr(mh, m);
2929                 M_ALIGN(mh, sizeof(*ip6));
2930                 m->m_len -= sizeof(*ip6);
2931                 m->m_data += sizeof(*ip6);
2932                 mh->m_next = m;
2933                 m = mh;
2934                 m->m_len = sizeof(*ip6);
2935                 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6));
2936         }
2937         exthdrs->ip6e_ip6 = m;
2938         return 0;
2939 }
2940
2941 /*
2942  * Compute IPv6 extension header length.
2943  */
2944 int
2945 ip6_optlen(struct inpcb *in6p)
2946 {
2947         int len;
2948
2949         if (!in6p->in6p_outputopts)
2950                 return 0;
2951
2952         len = 0;
2953 #define elen(x) \
2954     (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0)
2955
2956         len += elen(in6p->in6p_outputopts->ip6po_hbh);
2957         if (in6p->in6p_outputopts->ip6po_rthdr)
2958                 /* dest1 is valid with rthdr only */
2959                 len += elen(in6p->in6p_outputopts->ip6po_dest1);
2960         len += elen(in6p->in6p_outputopts->ip6po_rthdr);
2961         len += elen(in6p->in6p_outputopts->ip6po_dest2);
2962         return len;
2963 #undef elen
2964 }